Add alpine based Dockerfile

[wallyqs]

Adds extra Dockerfile image that can be used to build the server from master.

docker build -f docker/Dockerfile.alpine -t <image:tag> .

Signed-off-by: Waldemar Quevedo wally@synadia.com

• Link to issue, e.g. Resolves #NNN
• Documentation added (if applicable)
• Tests added
• Branch rebased on top of current master (git pull --rebase origin master)
• Changes squashed to a single commit (described here)
• Build is green in Travis CI
• You have certified that the contribution is your original work and that you license the work to the project under the Apache 2 license

Changes proposed in this pull request:

• Add Dockerfile.alpine to build latest nats server image

/cc @nats-io/core

[kozlovic]

LGTM

[kozlovic]

For the record: you would run this from your gnatsd directory. Whatever the state or your current branch is is what will be used to build the image.

[derekcollison]

I think we should create a dir, nats I think, have bin and conf dirs. sym link /nats/bin/gnatsd to /bin

[wallyqs]

Sorry for the delay, I have applied the changes and this is how it looks now:

$ docker run --entrypoint /bin/sh -it wallyqs/nats-server:edge
...
/ # tree /nats/
/nats/
├── bin
│   └── gnatsd
└── conf
    └── gnatsd.conf

2 directories, 2 files
/ # ls -la /bin/ | grep gnatsd -A1 -B1
lrwxrwxrwx    1 root     root            12 Sep 11 20:23 getopt -> /bin/busybox
lrwxrwxrwx    1 root     root            16 Dec 21 17:31 gnatsd -> /nats/bin/gnatsd
lrwxrwxrwx    1 root     root            12 Sep 11 20:23 grep -> /bin/busybox
/ # ls -la /nats/*/*
-rwxr-xr-x    1 root     root       8932640 Dec 21 17:30 /nats/bin/gnatsd
-rw-r--r--    1 root     root           671 Dec 21 17:05 /nats/conf/gnatsd.conf

$ docker run wallyqs/nats-server:edge
[1] 2018/12/21 17:43:36.979863 [INF] Starting nats-server version 2.0.0-beta.12
[1] 2018/12/21 17:43:36.979973 [INF] Git commit [2bc515a]
[1] 2018/12/21 17:43:36.980124 [INF] Starting http monitor on 0.0.0.0:8222
[1] 2018/12/21 17:43:36.980349 [INF] Listening for client connections on 0.0.0.0:4222
[1] 2018/12/21 17:43:36.980404 [INF] Server id is NDEHGDUGIFECN7NUZUPOEDEDVOGAPEWHQSPEGGQNSMIZFVIO2MPZSURN
[1] 2018/12/21 17:43:36.980429 [INF] Server is ready
[1] 2018/12/21 17:43:36.981009 [INF] Listening for route connections on 0.0.0.0:6222
^C[1] 2018/12/21 17:43:37.816006 [INF] Server Exiting..

[derekcollison]

ok getting closer. We should symlink the binary to /bin/nats-server IMO.
Also move gnatsd to nats-server in prep for rename.

[derekcollison]

How would a user easily provide their own config to run this docker image? Is it easy?

[wallyqs]

Sounds good on renaming, will make the changes.

About custom config, since we are using alpine then users could do something like this too now without having to mount volumes for example:

docker run --entrypoint /bin/sh wallyqs/nats-server:edge-2 -c '
cat > /nats/conf/gnatsd.conf <<CONF
  listen = 4222
  authorization {
    user = foo
    pass = bar
  }   
CONF
/bin/gnatsd -c /nats/conf/gnatsd.conf
'

[derekcollison]

That seems correct to me.

[wallyqs]

Using volumes then yes would also be possible to override with a local file, for example:

$ echo '
  listen = 4333
' > my-nats.conf

$ docker run -v $(pwd)/my-nats.conf:/nats/conf/nats.conf -it wallyqs/nats-server:edge
[1] 2018/12/21 20:12:19.113881 [INF] Starting nats-server version 2.0.0-beta.12
[1] 2018/12/21 20:12:19.114099 [INF] Listening for client connections on 0.0.0.0:4333

[derekcollison]

ok that looks good. Should we call it nats-server.conf?

[wallyqs]

sgtm!

[wallyqs]

ok updated so that it is now nats-server.conf

[coveralls]

Coverage increased (+0.04%) to 91.607% when pulling 0c65fe7 on alpine-dockerfile into f10020e on master.

[derekcollison]

Maybe have server conf be nats-server.conf, but otherwise LGTM. Nice..

[derekcollison]

LGTM