Here are some simple but useful docker exec commands for Discourse (assume the container is called app in the standard OOTB configuration):
Running top inside the app container, display on the host:
docker exec -it app top
Add net-tools to the container on Ubuntu using apt outside the container (on the host):
# docker exec -it app apt install net-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
net-tools is already the newest version (1.60+git20180626.aebd88e-1).
The following package was automatically installed and is no longer required:
libllvm7
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
Check to see if Rails is running in the Docker container on port 3000:
# docker exec -it app netstat -an | grep :3000
tcp 0 0 127.0.0.1:3000 0.0.0.0:* LISTEN
Check to see if a web server in the Discourse app container is listening on port 80:
# docker exec -it app netstat -an | grep :80
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
Check the nginx error log inside the Discourse app container from the host:
# docker exec -it app tail -f /var/log/nginx/error.log
Check the current Redix log inside the Discourse app container from the host:
# docker exec -it app tail -f /var/log/redis/current
638:M 08 Jun 2020 09:17:47.070 * 10 changes in 300 seconds. Saving...
638:M 08 Jun 2020 09:17:47.072 * Background saving started by pid 111425
111425:C 08 Jun 2020 09:17:47.199 * DB saved on disk
111425:C 08 Jun 2020 09:17:47.213 * RDB: 0 MB of memory used by copy-on-write
638:M 08 Jun 2020 09:17:47.298 * Background saving terminated with success
638:M 08 Jun 2020 09:22:48.032 * 10 changes in 300 seconds. Saving...
638:M 08 Jun 2020 09:22:48.032 * Background saving started by pid 111785
111785:C 08 Jun 2020 09:22:48.047 * DB saved on disk
111785:C 08 Jun 2020 09:22:48.048 * RDB: 0 MB of memory used by copy-on-write
638:M 08 Jun 2020 09:22:48.133 * Background saving terminated with success
List plugins in the plugin directory in the container:
# docker exec -it app ls -l /var/www/discourse/plugins
total 36
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 discourse-details
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 discourse-local-dates
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 discourse-narrative-bot
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 discourse-presence
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 discourse-unsupported-browser
drwxr-xr-x 12 discourse root 4096 Jun 7 04:49 docker_manager
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 lazy-yt
drwxr-xr-x 11 discourse root 4096 Jun 7 04:49 neo-revive-discourse
drwxr-xr-x 1 discourse discourse 4096 Jun 7 04:49 poll
Check the overall Docker allocated disk space in the container:
# docker exec -it app df
Filesystem 1K-blocks Used Available Use% Mounted on
overlay 51043548 26452540 21979460 55% /
tmpfs 65536 0 65536 0% /dev
tmpfs 1017712 0 1017712 0% /sys/fs/cgroup
shm 524288 8 524280 1% /dev/shm
/dev/sda 51043548 26452540 21979460 55% /shared
tmpfs 1017712 0 1017712 0% /proc/acpi
tmpfs 1017712 0 1017712 0% /proc/scsi
tmpfs 1017712 0 1017712 0% /sys/firmware
Install a plugin with git, clear the cache and restart unicorn from outside the container:
# docker exec -it app git clone <your favorite discourse plugin> /var/www/discourse/plugins
# docker exec -it app rm -rf /var/www/discourse/tmp/cache
# docker exec -it app /usr/bin/sv restart unicorn
ok: run: unicorn: (pid 112786) 0s
Check which version(s) of postgresql is installed in the app container from the host:
# docker exec -it app ls -l /etc/postgresql
total 4
drwxr-xr-x 3 postgres postgres 4096 Jun 7 04:49 10
Does anyone have any more useful docker exec commands to run outside the Discourse container when administering the containerized app??
If so, please share them with everyone.
Thanks.