Re: [gentoo-user] Performing a backup during the boot sequence
On 05/26/2010 12:30 AM, Allan Gottlieb wrote: For quite a while I have used the following steps to perform a single-user backup 1. Boot to single user mode via the grub command kernel /boot/vmlinuz root=/dev/sda6 single 2. Type in the root password. 3. Execute a single command /usr/local/sbin/ajg-backup-init-3 which does the backup and then executes init 3 4. This gets me to multi-user mode. I would like to automate this so that booting directly to multi-user mode via kernel /boot/vmlinuz root=/dev/sda6 All I need to do is to execute the single command /usr/local/sbin/ajg-backup-init-3 at the right moment. This didn't seem hard; I want it after everything in boot but before everything currently in default. So I was going to put it in default with a before * in depend() Reading the gentoo handbook chapter B4.d Writing Init Scripts I find two comments criticizing this approach 1. You can also use the * glob [argument to before] to catch all services in the same runlevel, although this isn't advisable. 2. Note: Make sure that --exec actually calls a service and not just a shell script that launches services and exits -- that's what the init script is supposed to do. I can see problems with multiple before * directives, but no other script has one so I think I would be OK with my before *. Criticism 2 has me concerned since my backup routing is indeed a shell script that exits. Indeed, my backup is not really a service so I am worried that I shouldn't be using an initscript at all. Any advice/comments would be welcome. thanks, allan You could create a LVM-snapshot of the partition/data you wish to backup at before * or inside boot and then later run the backup on the mounted snapshot, removing it afterwards. Bye, Daniel -- PGP key @ http://pgpkeys.pca.dfn.de/pks/lookup?search=0xBB9D4887op=get # gpg --recv-keys --keyserver hkp://subkeys.pgp.net 0xBB9D4887 signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] Performing a backup during the boot sequence
At Wed, 26 May 2010 17:17:45 +0200 Daniel Troeder dan...@admin-box.com wrote: On 05/26/2010 12:30 AM, Allan Gottlieb wrote: For quite a while I have used the following steps to perform a single-user backup 1. Boot to single user mode via the grub command kernel /boot/vmlinuz root=/dev/sda6 single 2. Type in the root password. 3. Execute a single command /usr/local/sbin/ajg-backup-init-3 which does the backup and then executes init 3 4. This gets me to multi-user mode. I would like to automate this so that booting directly to multi-user mode via kernel /boot/vmlinuz root=/dev/sda6 All I need to do is to execute the single command /usr/local/sbin/ajg-backup-init-3 at the right moment. This didn't seem hard; I want it after everything in boot but before everything currently in default. So I was going to put it in default with a before * in depend() Reading the gentoo handbook chapter B4.d Writing Init Scripts I find two comments criticizing this approach 1. You can also use the * glob [argument to before] to catch all services in the same runlevel, although this isn't advisable. 2. Note: Make sure that --exec actually calls a service and not just a shell script that launches services and exits -- that's what the init script is supposed to do. I can see problems with multiple before * directives, but no other script has one so I think I would be OK with my before *. Criticism 2 has me concerned since my backup routing is indeed a shell script that exits. Indeed, my backup is not really a service so I am worried that I shouldn't be using an initscript at all. Any advice/comments would be welcome. You could create a LVM-snapshot of the partition/data you wish to backup at before * or inside boot and then later run the backup on the mounted snapshot, removing it afterwards. Thanks, but I am not trying to minimize the boot time. The disk to disk dumps are fast enough (I do the slower copy to a remote site after logged in). I am just trying to have the dump done at the right point in the boot sequence without manually going into single user mode. If I could automate the snapshot, I could automate the dump. Indeed rereading the gentoo manual, I see that the requirement that you invoke a service and not a script that exits, applies only to start-stop-daemon, so I will just try to invoke my script directly from the init script. allan
[gentoo-user] Performing a backup during the boot sequence
For quite a while I have used the following steps to perform a single-user backup 1. Boot to single user mode via the grub command kernel /boot/vmlinuz root=/dev/sda6 single 2. Type in the root password. 3. Execute a single command /usr/local/sbin/ajg-backup-init-3 which does the backup and then executes init 3 4. This gets me to multi-user mode. I would like to automate this so that booting directly to multi-user mode via kernel /boot/vmlinuz root=/dev/sda6 All I need to do is to execute the single command /usr/local/sbin/ajg-backup-init-3 at the right moment. This didn't seem hard; I want it after everything in boot but before everything currently in default. So I was going to put it in default with a before * in depend() Reading the gentoo handbook chapter B4.d Writing Init Scripts I find two comments criticizing this approach 1. You can also use the * glob [argument to before] to catch all services in the same runlevel, although this isn't advisable. 2. Note: Make sure that --exec actually calls a service and not just a shell script that launches services and exits -- that's what the init script is supposed to do. I can see problems with multiple before * directives, but no other script has one so I think I would be OK with my before *. Criticism 2 has me concerned since my backup routing is indeed a shell script that exits. Indeed, my backup is not really a service so I am worried that I shouldn't be using an initscript at all. Any advice/comments would be welcome. thanks, allan
