Re: [OT] Tomcat app within docker container

[logo]

Martynas,

> Am 09.01.2020 um 23:12 schrieb Martynas Jusevičius :
> 
> Forget Kubernetes for now :)
> 
> My recipe is using a multi-stage build. Very crudely:
> 
> FROM maven as maven
> # build your webapp into a .war
> mvn clean install
> 
> FROM tomcat
> COPY --from=maven /webapp/target/ROOT webapps/ROOT/
> 

NICE!

> It copies the whole folder from the build directory rather than the .war file.
> Here is an example:
> https://github.com/AtomGraph/LinkedDataHub/blob/master/Dockerfile
> 
> It does not use tomcat image directly but rather an intermediary image
> which adds config as ENV capabilities as well as LetsEncrypt
> certificates:
> https://hub.docker.com/r/atomgraph/letsencrypt-tomcat/
> 
> You might also want to take a look at the entrypoint script which is a
> bit more involved:
> https://github.com/AtomGraph/LinkedDataHub/blob/master/platform/entrypoint.sh
> 

Thanks for sharing. Will be very interesting to improve my deployment.


> Look at the container as a large function. Minimize the number of
> inputs to it - generate all the configs that can be generated and
> execute the init actions within Dockerfile and/or entrypoint. Mount
> the rest from host as volumes, under Tomcat's webapps/ROOT (assuming
> you're Dockerizing one webapp).
> 
> Martynas
> atomgraph.com
> 
> On Thu, Jan 9, 2020 at 8:32 PM Christopher Schultz
>  wrote:
>> 
>> -BEGIN PGP SIGNED MESSAGE-
>> Hash: SHA256
>> 
>> Pater,
>> 
>> On 1/9/20 12:39 PM, logo wrote:
 Am 09.01.2020 um 17:51 schrieb Alex K :
 
 Hi all,
 
 I have two .war files that when deployed at a plain Debian 9 VM
 are working fine. I have prepared a docker file so as to deploy
 the same apps within a docker container and for some reason one
 of the apps is not loading due to some error.
 
 Dockerfile: FROM debian:latest
>>> 
>>> Why not using any of the different flavored tomcat images?
>>> 
>>> https://hub.docker.com/_/tomcat 
>>> 
>>> You get a working jdk (oracle, adopt, openjdk) and don’t have to
>>> build the system yourself. That may help to get the base running
>>> and then copy your file to the correct spots.
>> 
>> If you've got experience with Docker, I'd love for someone to put
>> together a post/presenation/whatever which addresses this question:
>> 
>> I've got an application that I deploy to Tomcat on a traditional
>> server; How do I Dockerize that?
>> 
>> Specifically, I'd like more than just "well, docker-compose with your
>> WAR file and put it in the right place" because we all know that there
>> are plenty of configuration files, etc. that don't work well with a
>> WAR file, etc.
>> 
>> So maybe this bleeds into "well, if you want to use Docker, maybe you
>> want to consider Kubernetes for configuration" and then explain how
>> you might move some of your server/application configuration into
>> Kubernetes (or similar). I'd like to understand how to package-up
>> things like this to be able to eventually use something like AWS's
>> auto-scaling.
>> 
>> - -chris
>> -BEGIN PGP SIGNATURE-
>> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
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>> =PK8y
>> -END PGP SIGNATURE-
>> 
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Re: [OT] Tomcat app within docker container

[Martynas Jusevičius]

Forget Kubernetes for now :)

My recipe is using a multi-stage build. Very crudely:

FROM maven as maven
# build your webapp into a .war
mvn clean install

FROM tomcat
COPY --from=maven /webapp/target/ROOT webapps/ROOT/

It copies the whole folder from the build directory rather than the .war file.
Here is an example:
https://github.com/AtomGraph/LinkedDataHub/blob/master/Dockerfile

It does not use tomcat image directly but rather an intermediary image
which adds config as ENV capabilities as well as LetsEncrypt
certificates:
https://hub.docker.com/r/atomgraph/letsencrypt-tomcat/

You might also want to take a look at the entrypoint script which is a
bit more involved:
https://github.com/AtomGraph/LinkedDataHub/blob/master/platform/entrypoint.sh

Look at the container as a large function. Minimize the number of
inputs to it - generate all the configs that can be generated and
execute the init actions within Dockerfile and/or entrypoint. Mount
the rest from host as volumes, under Tomcat's webapps/ROOT (assuming
you're Dockerizing one webapp).

Martynas
atomgraph.com

On Thu, Jan 9, 2020 at 8:32 PM Christopher Schultz
 wrote:
>
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA256
>
> Pater,
>
> On 1/9/20 12:39 PM, logo wrote:
> >> Am 09.01.2020 um 17:51 schrieb Alex K :
> >>
> >> Hi all,
> >>
> >> I have two .war files that when deployed at a plain Debian 9 VM
> >> are working fine. I have prepared a docker file so as to deploy
> >> the same apps within a docker container and for some reason one
> >> of the apps is not loading due to some error.
> >>
> >> Dockerfile: FROM debian:latest
> >
> > Why not using any of the different flavored tomcat images?
> >
> > https://hub.docker.com/_/tomcat 
> >
> > You get a working jdk (oracle, adopt, openjdk) and don’t have to
> > build the system yourself. That may help to get the base running
> > and then copy your file to the correct spots.
>
> If you've got experience with Docker, I'd love for someone to put
> together a post/presenation/whatever which addresses this question:
>
> I've got an application that I deploy to Tomcat on a traditional
> server; How do I Dockerize that?
>
> Specifically, I'd like more than just "well, docker-compose with your
> WAR file and put it in the right place" because we all know that there
> are plenty of configuration files, etc. that don't work well with a
> WAR file, etc.
>
> So maybe this bleeds into "well, if you want to use Docker, maybe you
> want to consider Kubernetes for configuration" and then explain how
> you might move some of your server/application configuration into
> Kubernetes (or similar). I'd like to understand how to package-up
> things like this to be able to eventually use something like AWS's
> auto-scaling.
>
> - -chris
> -BEGIN PGP SIGNATURE-
> Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/
>
> iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl4Xf6sACgkQHPApP6U8
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> =PK8y
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Re: [OT] Tomcat app within docker container

[Christopher Schultz]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

Pater,

On 1/9/20 12:39 PM, logo wrote:
>> Am 09.01.2020 um 17:51 schrieb Alex K :
>> 
>> Hi all,
>> 
>> I have two .war files that when deployed at a plain Debian 9 VM
>> are working fine. I have prepared a docker file so as to deploy
>> the same apps within a docker container and for some reason one
>> of the apps is not loading due to some error.
>> 
>> Dockerfile: FROM debian:latest
> 
> Why not using any of the different flavored tomcat images?
> 
> https://hub.docker.com/_/tomcat 
> 
> You get a working jdk (oracle, adopt, openjdk) and don’t have to
> build the system yourself. That may help to get the base running
> and then copy your file to the correct spots.

If you've got experience with Docker, I'd love for someone to put
together a post/presenation/whatever which addresses this question:

I've got an application that I deploy to Tomcat on a traditional
server; How do I Dockerize that?

Specifically, I'd like more than just "well, docker-compose with your
WAR file and put it in the right place" because we all know that there
are plenty of configuration files, etc. that don't work well with a
WAR file, etc.

So maybe this bleeds into "well, if you want to use Docker, maybe you
want to consider Kubernetes for configuration" and then explain how
you might move some of your server/application configuration into
Kubernetes (or similar). I'd like to understand how to package-up
things like this to be able to eventually use something like AWS's
auto-scaling.

- -chris
-BEGIN PGP SIGNATURE-
Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/

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=PK8y
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