Launcher run works different than enter and run command

installation
8

Glad you said that.

I know the post is from 2018, but that was probably not a simple command to get right given the expected users.

I have been spending the last few days taking the launcher script apart piece by piece and am now on the run command. When working on the launcher commands I also try to recreate the same steps using the docker commands used.

For run I knew there were two docker commands that use run

docker container run
docker run

but not being a Docker expert I can not explain to the rubber duck what the differences are or if there are none.

So when I tried a simple ls, it took so long I almost took a beverage break. It did return a correct ls result so that is when I took a look at exactly what launcher run was doing.

When I saw this

  (exec $docker_path run --rm --shm-size=512m $user_args $links "${env[@]}" -e DOCKER_HOST_IP="$docker_ip" -i -a stdin -a stdout -a stderr $volumes $run_image \
    /bin/bash -c "$run_command") || ERR=$?

I could not believe it. I haven’t asked why it is that way because sometimes the answer is in a post if you look for it, but also if I don’t find the answer I will be much better informed.

** EDIT **

Related post: Trying to understand launcher as a series of Docker commands

Result of running launcher run app ls as noted in related post, i.e.

groot@galaxy:/var/discourse$ sudo bash -x launcher run app ls 2> ~/traces/ls_01
eric@swi-prolog:/var/discourse$ grep /usr/bin/docker ~/traces/ls_01

Otuput:

+ docker_path=/usr/bin/docker
+ '[' -z /usr/bin/docker ']'
++ /usr/bin/docker info
+ /usr/bin/docker info
++ /usr/bin/docker --version
++ /usr/bin/docker images
++ /usr/bin/docker run -i --rm -a stdout -a stderr discourse/base:2.0.20200512-1735 echo working
++ /usr/bin/docker info --format '{{.DockerRootDir}}'
+ '[' -z /usr/bin/docker ']'
++ /usr/bin/docker --version
+++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''templates'\'']'
++++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''templates'\'']'
++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''
++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''
++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''
++ /usr/bin/docker run --rm -i -a stdout -a stdin discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''docker_args'\'']'
++ /usr/bin/docker run --rm -i -a stdout -a stdin discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''volumes'\''].map{|v| '\''-v '\'' << v['\''volume'\'']['\''host'\''] << '\'':'\'' << v['\''volume'\'']['\''guest'\''] << '\'' '\''}.join'
++ /usr/bin/docker run --rm -i -a stdout -a stdin discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''links'\''].map{|l| '\''--link '\'' << l['\''link'\'']['\''name'\''] << '\'':'\'' << l['\''link'\'']['\''alias'\''] << '\'' '\''}.join'
++ /usr/bin/docker run --rm -i -a stdin -a stdout discourse/base:2.0.20200512-1735 ruby -e 'require '\''yaml'\''; puts YAML.load(STDIN.readlines.join)['\''run_image'\'']'
+ exec /usr/bin/docker run --rm --shm-size=512m -e LANG=en_US.UTF-8 -e RAILS_ENV=production -e UNICORN_WORKERS=4 -e UNICORN_SIDEKIQS=1 -e RUBY_GLOBAL_METHOD_CACHE_SIZE=131072 -e RUBY_GC_HEAP_GROWTH_MAX_SLOTS=40000 -e RUBY_GC_HEAP_INIT_SLOTS=400000 -e RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR=1.5 -e DISCOURSE_DB_SOCKET=/var/run/postgresql -e DISCOURSE_DB_HOST= -e DISCOURSE_DB_PORT= -e LETSENCRYPT_DIR=/shared/letsencrypt -e DISCOURSE_HOSTNAME=discourse.galaxy.org -e DISCOURSE_DEVELOPER_EMAILS=groot@galaxy.org -e DISCOURSE_SMTP_ADDRESS=smtp.mailgun.org -e DISCOURSE_SMTP_PORT=587 -e DISCOURSE_SMTP_USER_NAME=groot@mg.galaxy.org -e DISCOURSE_SMTP_PASSWORD= I_am_Groot -e LETSENCRYPT_ACCOUNT_EMAIL=groot@galaxy.org -e DOCKER_HOST_IP=NNN.MMM.OOO.PPP -i -a stdin -a stdout -a stderr -v /var/discourse/shared/standalone:/shared -v /var/discourse/shared/standalone/log/var-log:/var/log local_discourse/app /bin/bash -c ls
``