Some programs like ctop are nice to run using docker containers, so that you don't have to manually download a binary and copy it into /usr/local/bin, where it will sit in a sad little corner, unmanaged by apt or yum.
Top-like interface for container metrics
ctop provides a concise and condensed overview of real-time metrics for multiple containers:
as well as a single container view for inspecting a specific container.
ctop comes with built-in support for Docker and runC; connectors for other container and cluster systems are planned for future releases.
Install
Fetch the latest release for your platform:
Debian/Ubuntu
Maintained by a third party
echo "deb http://packages.azlux.fr/debian/ buster main" | sudo tee /etc/apt/sources.list.d/azlux.list
wget -qO - https://azlux.fr/repo.gpg.key | sudo apt-key add -
sudo apt update
sudo apt install docker-ctop
Arch
ctop is available for Arch in the AUR
Linux (Generic)
sudo wget https://github.com/bcicen/ctop/releases/download/v0.7.7/ctop-0.7.7-linux-amd64 -O /usr/local/bin/ctop
sudo chmod +x /usr/local/bin/ctop
OS X
brew install ctop
or
sudo port install ctop
or
sudo curl -Lo /usr/local/bin/ctop https://github.com/bcicen/ctop/releases/download/v0.7.7/ctop-0.7.7-darwin-amd64
sudo chmod +x /usr/local/bin/ctop
Docker
docker run --rm -ti \
--name=ctop \
--volume /var/run/docker.sock:/var/run/docker.sock:ro \
quay.io/vektorlab/ctop:latest
Building
Build steps can be found…
But if you run an SELinux-enabled distribution, you'll find that running ctop as the documentation suggests, fails:
docker run --rm -ti \
--name=ctop \
--volume /var/run/docker.sock:/var/run/docker.sock:ro \
quay.io/vektorlab/ctop:latest
🐳 🐳 🐳
ctop - error ───────
│ │
│ [12:54:15 UTC] attempting to reconnect... │
│ │
│ [12:54:16 UTC] Get http://unix.sock/info: dial unix /var/run/docker.sock: con │
│ nect: permission denied
What's going on here? Presumably SELinux is blocking the ctop container's access to information necessary for monitoring the other containers.
The Fix
Luckily, there's a very easy fix for this! You can just run the ctop container in privileged mode:
docker run --privileged --rm -ti \
--name=ctop \
--volume /var/run/docker.sock:/var/run/docker.sock:ro quay.io/vektorlab/ctop:latest
Now you can see all your favorite containers, interact with their log interfaces, dip into their shells, etc:
ctop - 12:57:42 UTC 8 containers
NAME CID CPU MEM NET RX/TX IO R/W PIDS
◉ bugout_bot… 8f84fe3983… 1% 2M / 944M 19M / 16M 1M / 0B 6
◉ bugout_bug… 16f1479be4… 0% 3M / 944M 1M / 1M 6M / 0B 5
◉ bugout_gat… fc951914df… 0% 3M / 944M 56M / 35M 256K / 0B 21
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