Painless Docker - 2nd Edition

Troubleshooting Docker Using Sysdig

There are several tools available for troubleshooting Docker. One of them is Sysdig. Sysdig is a Linux system exploration and troubleshooting tool that provides support for containers.

To install Sysdig, simply run the following command. This is the recommended installation method.

curl -s https://download.sysdig.com/stable/install-sysdig | sudo bash

You can also install Sysdig using your Linux distribution package manager:

apt install sysdig

Or by running it in a container:

sudo docker run --rm -i -t -d --privileged --net=host \
    -v /var/run/docker.sock:/host/var/run/docker.sock \
    -v /dev:/host/dev \
    -v /proc:/host/proc:ro \
    -v /boot:/host/boot:ro \
    -v /src:/src \
    -v /lib/modules:/host/lib/modules:ro \
    -v /usr:/host/usr:ro \
    -v /etc:/host/etc:ro \
    docker.io/sysdig/sysdig

We're going to install using the script method. The script will install the Sysdig repository and the Sysdig package.

Then add your username to the same group as Sysdig:

# Create a new group
groupadd sysdig

# Add the user to the group
usermod -aG sysdig $USER

Use visudo to edit the "sudo-config" file and add the line %sysdig ALL=/usr/bin/sysdig. Save the changes. These configurations will allow you to run Sysdig without using sudo.

Sysdig can be used to obtain information about:

• Networking
• Containers
• Applications
• Disk I/O
• Processes and CPU usage
• Performance and Errors
• Security
• Tracing