RE: Tomcat reboot runtime
Hi, Yeah, but that's too external (and custom) or too OS-dependent (for the bash process thing). The ListenExec idea is decent at its core. It's not too clean (having to make a socket call, needing to secure that call, needing to configure a password somewhere, etc), but considering the dirtiness of other solutions I've seen in this space it's not bad. I still stick my by original no response when it comes to a portable, stand-along solution given the current tomcat codebase. And I would still love to be proven otherwise by some ingenious design, but this is an old problem ;) I don't think Enhydra was tomcat based, but I'm not sure, if Jacob (Kjome) is watching this thread he might shed some light on that. Remember, though, the idea (request of the original poster) wasn't to have an admin restart the server from a management console. Of course that's doable. It was to have a webapp running inside tomcat reboot its own server. Yoav Shapira Millennium Research Informatics -Original Message- From: Matthew Clark [mailto:[EMAIL PROTECTED] Sent: Sunday, May 16, 2004 5:40 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime If I remember rightly, the Enhydra Multiserver allowed you to restart the server from the web based administration console. Enhydra was tomcat based I believe.. So how did they achieve this (I don't know.. It's possible they weren't fully stopping the JVM and starting a new process) They also allowed you to stop from the HTML console which, obviously, made restarting it again a little tricky from the admin console.. I guess they thought it was easier than typing multiserver -stop from a command line?? We did it using shell scripts on our servers.. The tomcat process is protected by a restart script anyway (we found that some native libraries can completely screw up the JVM, causing memory errors and exit - its rare but we just need the container to restart in these situations). So we have a stop script that attempts to stop tomcat the nice way, a kill script and restart and start scripts... These are just called from an admin console that runs outside of the tomcat (PHP). Regards, Matthew -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: 14 May 2004 14:30 To: Tomcat Users List Subject: RE: Tomcat reboot runtime NB As a relative novice to Tomcat it astonishs me that the Tomcat Manager does not provide the functionnality to reboot the server at runtime (taking in account that it services become unavailable during reboot time). Show me a server that does. Nearly all let you reload apps, some let you update JNDI entries etc, a few let you add new connectors etc., but a complete reboot meaning a new JVM process is different. Yoav This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
If I remember rightly, the Enhydra Multiserver allowed you to restart the server from the web based administration console. Enhydra was tomcat based I believe.. So how did they achieve this (I don't know.. It's possible they weren't fully stopping the JVM and starting a new process) They also allowed you to stop from the HTML console which, obviously, made restarting it again a little tricky from the admin console.. I guess they thought it was easier than typing multiserver -stop from a command line?? We did it using shell scripts on our servers.. The tomcat process is protected by a restart script anyway (we found that some native libraries can completely screw up the JVM, causing memory errors and exit - its rare but we just need the container to restart in these situations). So we have a stop script that attempts to stop tomcat the nice way, a kill script and restart and start scripts... These are just called from an admin console that runs outside of the tomcat (PHP). Regards, Matthew -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: 14 May 2004 14:30 To: Tomcat Users List Subject: RE: Tomcat reboot runtime NB As a relative novice to Tomcat it astonishs me that the Tomcat Manager does not provide the functionnality to reboot the server at runtime (taking in account that it services become unavailable during reboot time). Show me a server that does. Nearly all let you reload apps, some let you update JNDI entries etc, a few let you add new connectors etc., but a complete reboot meaning a new JVM process is different. Yoav This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reboot runtime
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 a daemon thread is just an ordinary thread that has been set as a daemon. their purpose is to be servant threads. when there are only daemon threads left a program will exit. as such, it executes in the same jvm instance as it's parent. parent spawns daemon, daemon spawns shell, shell runs command to kill parent which kills daemon which kills shell which kills command. just a big circle. i don't know about other OS, but the process control features of the bash shell on linux would allow what i think you are trying to achieve. don't worry about needing a thread. just try something like String command = /where/your/script/lives/scriptname restart disown; getRuntime().exec(command); regards, Kevin QM wrote: | It just hit me -- | what about a (protected) servlet that spawns a daemon thread, which in | turn calls Runtime.exec( tomcat stop / start script)? | | Admittedly, I'm hazy on my Java threading right now, but if that would | work then it's something that's completley within the container, and no | more than a few lines of code. | | -or am I off my rocker? ;) | | -QM | -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFApmyuJ7Xd6MyEGu4RAkNEAJ4qwRZp5bln3yilMmONhN9BHlEp4ACfdc8Y lgmuKMq/TdyWn4ECzYNP1iM= =/mzN -END PGP SIGNATURE- - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reboot runtime
On Sat, May 15, 2004 at 03:17:02PM -0400, Kevin D. Offet wrote: : i don't know about other OS, but the process control features of the : bash shell on linux would allow what i think you are trying to achieve. Yes, shortly after I posted that message I did more digging on Java threads and realized the flaw. ;) Back to the ListenExec idea... : String command = /where/your/script/lives/scriptname restart disown; : getRuntime().exec(command); Called from the container, that may cause other problems: Runtime.exec() forks a process from the parent JVM. Solaris, for one, implements COW for fork()'d processes but still requires there be enough memory for the new process to have a full copy should it need it. On a dedicated machine, when the JVM holds most of the RAM, that would make the fork() impossible. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Hi, 1. The original question was if there is some highly tomcat-specific code that enables a reboot at runtime. Spending very little time going through the source code of catalina, it seems to me that even highly tomcat- specific code does not support a reboot a runtime. This is true, which is why I said a simple No to the original post as asked. Other people have since taken other approaches, but none nail the original question. 2. One solution could be to call a shell script from within the webapplication running on Tomcat, reboot Tomcat, accepting in this way that the application and tomcat will be unavailable during some reboot time. On the other hand, this could not be regarded as a good coding practice, in my opinion. I agree in general, though under specific circumstances (highly controlled environments) this could be fine. 3. Another solution could be to have the application create a new process in the JVM responsible for stopping and starting the tomcat service. But then again this process could only do so by calling a script as in the solution proposed in 2, with it same consequences (seems to me I might as well be wrong). Yup, that's an option. The Classloader issues could be HORRENDOUS. NB As a relative novice to Tomcat it astonishs me that the Tomcat Manager does not provide the functionnality to reboot the server at runtime (taking in account that it services become unavailable during reboot time). Show me a server that does. Nearly all let you reload apps, some let you update JNDI entries etc, a few let you add new connectors etc., but a complete reboot meaning a new JVM process is different. Yoav This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
The script will need to be a 2 stage process otherwise the kill tomcat command will kill your shell as part of its shutdown sequence and the rest of your script will not execute (no restart). Stage 1. - start disconnected sub shell for process 2 Stage 2. - kill tomcat, sleep, start tomcat In most UNIX shell these is a nohup command that disconnects the shell for daemon processing that should work. You can either script both parts or build the correct nohup shell and do stage 2 from java. -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 9:02 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Hi, What's running your program (in order to wait and issue a startup command) after you've done a shutdown? ;) (Unless you're talking about highly tomcat-specific code that shuts down tomcat and leaves the JVM itself running) Yoav Shapira Millennium Research Informatics -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:55 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Personally, I don't see why the scheme that Adam came up with wouldn't work. You would want your program to do a shutdown, wait, then issue a startup command. --Tim Sabin Shapira, Yoav [EMAIL PROTECTED] 05/13/2004 11:23 AM Please respond to Tomcat Users List [EMAIL PROTECTED] To Tomcat Users List [EMAIL PROTECTED] cc Subject RE: Tomcat reboot runtime Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED
RE: Tomcat reboot runtime
Hi, Any portable solutions (that would work on windows, not just unix, and on MacOS)? Yoav Shapira Millennium Research Informatics -Original Message- From: Richard Calosso [mailto:[EMAIL PROTECTED] Sent: Friday, May 14, 2004 12:55 PM To: 'Tomcat Users List' Subject: RE: Tomcat reboot runtime The script will need to be a 2 stage process otherwise the kill tomcat command will kill your shell as part of its shutdown sequence and the rest of your script will not execute (no restart). Stage 1. - start disconnected sub shell for process 2 Stage 2. - kill tomcat, sleep, start tomcat In most UNIX shell these is a nohup command that disconnects the shell for daemon processing that should work. You can either script both parts or build the correct nohup shell and do stage 2 from java. -Original Message- From: Shapira, Yoav [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 9:02 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Hi, What's running your program (in order to wait and issue a startup command) after you've done a shutdown? ;) (Unless you're talking about highly tomcat-specific code that shuts down tomcat and leaves the JVM itself running) Yoav Shapira Millennium Research Informatics -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:55 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Personally, I don't see why the scheme that Adam came up with wouldn't work. You would want your program to do a shutdown, wait, then issue a startup command. --Tim Sabin Shapira, Yoav [EMAIL PROTECTED] 05/13/2004 11:23 AM Please respond to Tomcat Users List [EMAIL PROTECTED] To Tomcat Users List [EMAIL PROTECTED] cc Subject RE: Tomcat reboot runtime Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient
Re: Tomcat reboot runtime
On Fri, May 14, 2004 at 01:06:17PM -0400, Shapira, Yoav wrote: : : Any portable solutions (that would work on windows, not just unix, and : on MacOS)? A *very* alpha-tasting version is available at: http://downloads.brandxdev.net/tomcat-479785/listenexec-0.1.0alpha.tar.gz (written in Java) The premise is that this network listener, after performing some rudimentary authentication, accepts an alias from the client. In turn, the alias is mapped internally to a command that gets passed to Runtime.exec(). The aliases/commands are loaded from a properties file, one entry of which could be restart_tomcat : /etc/init.d/tomcat restart There's plenty of room to grow here, some of which is mentioned in the included readme. The code is still proof-of-concept (not a lot of error checking) but that will change with time. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Hi, How would the webapp invoke this listener? Yoav Shapira Millennium Research Informatics -Original Message- From: QM [mailto:[EMAIL PROTECTED] Sent: Friday, May 14, 2004 2:55 PM To: Tomcat Users List Subject: Re: Tomcat reboot runtime On Fri, May 14, 2004 at 01:06:17PM -0400, Shapira, Yoav wrote: : : Any portable solutions (that would work on windows, not just unix, and : on MacOS)? A *very* alpha-tasting version is available at: http://downloads.brandxdev.net/tomcat-479785/listenexec-0.1.0alpha.tar.g z (written in Java) The premise is that this network listener, after performing some rudimentary authentication, accepts an alias from the client. In turn, the alias is mapped internally to a command that gets passed to Runtime.exec(). The aliases/commands are loaded from a properties file, one entry of which could be restart_tomcat : /etc/init.d/tomcat restart There's plenty of room to grow here, some of which is mentioned in the included readme. The code is still proof-of-concept (not a lot of error checking) but that will change with time. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reboot runtime
On Fri, May 14, 2004 at 03:05:41PM -0400, Shapira, Yoav wrote: : Reply-To: Tomcat Users List [EMAIL PROTECTED] : How would the webapp invoke this listener? The listener would be started outside of the container, in a separate process. A (protected) JSP/servlet run wihtin the container would contact the listener with a socket call. Having it run outside of the container helps in situations where commons-daemon, as root, is used to bind to the port before switching uid's to the unprivileged Tomcat user. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reboot runtime
It just hit me -- what about a (protected) servlet that spawns a daemon thread, which in turn calls Runtime.exec( tomcat stop / start script)? Admittedly, I'm hazy on my Java threading right now, but if that would work then it's something that's completley within the container, and no more than a few lines of code. -or am I off my rocker? ;) -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Personally, I don't see why the scheme that Adam came up with wouldn't work. You would want your program to do a shutdown, wait, then issue a startup command. --Tim Sabin Shapira, Yoav [EMAIL PROTECTED] 05/13/2004 11:23 AM Please respond to Tomcat Users List [EMAIL PROTECTED] To Tomcat Users List [EMAIL PROTECTED] cc Subject RE: Tomcat reboot runtime Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reboot runtime
On Thu, May 13, 2004 at 11:23:17AM -0400, Shapira, Yoav wrote:
: I, on the other hand, would be interested to see what you come up with,
: so don't stop your train of thought on my account.
If you're looking for a full restart, there are several ways (in varying
levels of hackishness).
Once you've figured out the trigger (described below), it's a matter of
having that call:
{tomcat script} stop ; {tomcat script} start
Triggers:
1 changes in a file: under Linux, you could use FAM to monitor a file
(say, server.xml). Under OSs that don't support FAM you'd have to do
a periodic poll(), which may cause problems if there are many other
processes poll()ing for files.
2 Tomcat request: under Linux/Unix, a servlet/JSP could fire a
System.exec() that calls an at job. That would put the call
to the script outside of the current process.
(Not sure how calls to System.exec() are prohibited by the default
security manager.)
3 Without the at job, the container could create/update a specified
file watched by the FAM/poll() app...
etc, etc.
If anyone's interested in #1, I'd be happy to drive it. I've been
experimenting with FAM lately, and could probably whip up something that
supports non-FAM OSs, too... If you wanted to stick with Java (make it
cross-platform) that should be fairly straightforward, as well.
If you're looking to reload the *app* on file change, that's probably a
matter of having the trigger kick a JMX action. -but I've reached total
stream-of-consciousness here so I'll stop rambling... ;)
-QM
--
software -- http://www.brandxdev.net
tech news -- http://www.RoarNetworX.com
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Hi, What's running your program (in order to wait and issue a startup command) after you've done a shutdown? ;) (Unless you're talking about highly tomcat-specific code that shuts down tomcat and leaves the JVM itself running) Yoav Shapira Millennium Research Informatics -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:55 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Personally, I don't see why the scheme that Adam came up with wouldn't work. You would want your program to do a shutdown, wait, then issue a startup command. --Tim Sabin Shapira, Yoav [EMAIL PROTECTED] 05/13/2004 11:23 AM Please respond to Tomcat Users List [EMAIL PROTECTED] To Tomcat Users List [EMAIL PROTECTED] cc Subject RE: Tomcat reboot runtime Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
Hi, I'm not looking at highly specific tomcat code, that's way more complicated than I'm thinking about. I also don't see the need to faff about with shutdown - wait - startup. I was thinking (at a rather simplistic level) of having a restart script which can be called from a JSP / Java class. I'm sure a Java program could be written to call the shell script. Alternatively you could try and exploit the kill -HUP command. Probably the best way of doing this would be to setup tomcat to create a pid file on startup a la Apache. I will apologise now for not just going ahead and attempting to set this up of my own accord on my system. I have no Internet access at home (in fact I only just have a PC!) and work is far to hectic at this time for non-essential messing about (a great shame!) :-( Adam. On Thu, 2004-05-13 at 17:01, Shapira, Yoav wrote: Hi, What's running your program (in order to wait and issue a startup command) after you've done a shutdown? ;) (Unless you're talking about highly tomcat-specific code that shuts down tomcat and leaves the JVM itself running) Yoav Shapira Millennium Research Informatics -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:55 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Personally, I don't see why the scheme that Adam came up with wouldn't work. You would want your program to do a shutdown, wait, then issue a startup command. --Tim Sabin Shapira, Yoav [EMAIL PROTECTED] 05/13/2004 11:23 AM Please respond to Tomcat Users List [EMAIL PROTECTED] To Tomcat Users List [EMAIL PROTECTED] cc Subject RE: Tomcat reboot runtime Hi, I, on the other hand, would be interested to see what you come up with, so don't stop your train of thought on my account. Yoav Shapira Millennium Research Informatics -Original Message- From: Adam Buglass [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 11:13 AM To: Tomcat Users List Subject: RE: Tomcat reboot runtime Wouldn't it be possible to restart tomcat by writing a server-side program to trigger a shell-script?? Of course that may disrupt the operation of the website itself - I'd have to consult the docs to be clearer on that. If Yoav says it can't be done then I'm sure we'd be wasting our time by trying! ;-) However I'm curious, just thinking off the top of my head! :-) Adam On Thu, 2004-05-13 at 15:56, Shapira, Yoav wrote: Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may no - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Adam Buglass, The Golden Freeway, Department of Child Health, University of Newcastle-upon-Tyne. Royal Victoria Infirmary. (0191) 2023062 Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote. ~Benjamin Franklin, 1759 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may
RE: Tomcat reboot runtime
Hi, No to both. Yoav Shapira Millennium Research Informatics -Original Message- From: Rudolf Feyerkleist [mailto:[EMAIL PROTECTED] Sent: Thursday, May 13, 2004 8:11 AM To: [EMAIL PROTECTED] Subject: Tomcat reboot runtime Is there a way to restart tomcat from a webapplication running on tomcat? Or is there a way for canges to the server.xml of tomcat to become effective at runtime? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reboot runtime
1. The original question was if there is some highly tomcat-specific code that enables a reboot at runtime. Spending very little time going through the source code of catalina, it seems to me that even highly tomcat-specific code does not support a reboot a runtime. 2. One solution could be to call a shell script from within the webapplication running on Tomcat, reboot Tomcat, accepting in this way that the application and tomcat will be unavailable during some reboot time. On the other hand, this could not be regarded as a good coding practice, in my opinion. 3. Another solution could be to have the application create a new process in the JVM responsible for stopping and starting the tomcat service. But then again this process could only do so by calling a script as in the solution proposed in 2, with it same consequences (seems to me I might as well be wrong). I would be very pleased with any comments on the above Rudolf Feyerkleist NB As a relative novice to Tomcat it astonishs me that the Tomcat Manager does not provide the functionnality to reboot the server at runtime (taking in account that it services become unavailable during reboot time). Shapira, Yoav [EMAIL PROTECTED] wrote: Hi, What's running your program (in order to wait and issue a startup command) after you've done a shutdown? ;) (Unless you're talking about highly tomcat-specific code that shuts down tomcat and leaves the JVM itself running) Yoav Shapira Millennium Research Informatics - Do you Yahoo!? Yahoo! Movies - Buy advance tickets for 'Shrek 2'
Re: Tomcat reboot runtime
: [snip: discussion re: ways to restart Tomcat, preferably : through Tomcat itself] Option #4: a listener that exists outside the Tomcat process, which calls the container start/stop scripts on command. I'm whipping up a prototype now: it's a basic socket listener that stores the path to the Tomcat script and calls it when a certain command is sent to the port. I'll have a link tomorrow... : NB As a relative novice to Tomcat it astonishs me that the Tomcat Manager does not provide the functionnality to reboot the server at runtime (taking in account that it services become unavailable during reboot time). It's *possible*, certainly. The source code's available for anyone to work it out and submit patches back to the Apache group. -QM -- software -- http://www.brandxdev.net tech news -- http://www.RoarNetworX.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
