When I want to link multiple containers together, I use Docker Compose.
When you run Docker Compose, you will see the logs for each container, but you will see the logs for all containers on one screen.
I want to follow the log for each container, but it is hard to see the log of other containers in the middle of the log.
So, I tried to split the Docker Compose logs into tabs for each container.
Square Needle
We used an application called "Byobu", which is installed by default in Ubuntu and allows tab switching in the shell.
The usage of "Byobu" is summarized in a separate article.
Byobu Setting
To start Byobu with a set of tabs, first define a set of tabs and save them in the following file.
~/.byoku/windows.tmux.<tab set name>.
Then, set the environment variable "BYOBU_WINDOWS" to the "tab set name" and start Byobu with the set tab.
$ BYOBU_WINDOWS=<タブのセット名> byobu
The file is written as follows
First create a session, then add windows.
new-session -n <タブ名> <コマンド> new-window -n <タブ名> <コマンド> new-window -n <タブ名> <コマンド> new-window -n <タブ名> <コマンド> …
Dynamic generation of settings
Since the Byotu tab configuration file is a static file, a script is used to rewrite its contents each time the Docker Compose log is displayed.
view-compose-logs.sh
#!/bin/bash svcs=($(docker-compose config --services)) config="" first_svc=1 for svc in "${svcs[@]}" do if [ "$first_svc" = "1" ]; then config="new-session -n $svc docker-compose logs -f $svc;" first_svc=0 else config="${config}\nnew-window -n $svc docker-compose logs -f $svc;" fi done if [ "$config" != "" ]; then echo -e "$config" > ~/.byobu/windows.tmux.docker_compose_log BYOBU_WINDOWS=docker_compose_log byobu fi
execution
After starting Docker Compose with docker-compose up -d to separate it from the log, execute ./view-compose-logs.sh.
docker-compose up -d
./view-compose-logs.sh
For example, if you launch "Jenkins", "phpMyAdmin" and "MySQL" in Docker Compose
Jenkins
phpMyAdmin
MySQL
and the tabs will appear at the bottom and the logs will be divided into tabs.
Use "Alt+Left/Right keys" to switch tabs and "Ctrl+c" to close tabs.
Impressions, etc.
Ubuntu uses MATE for its desktop environment.
Until now, I have been using the following script to display Docker Compose logs in separate tabs in the MATE terminal.
#!/bin/bash svcs=($(docker-compose config --services)) for svc in "${svcs[@]}" do mate-terminal --profile=hold -e "docker-compose logs -f $svc" -t $svc --tab done
However, since it only works in an environment with a MATE terminal, we have changed it to a Byobu-based form so that it can be used in a CUI environment, such as SSH connection or Windows WSL.
