Scenario
After reinstalling my Linux Operating system recently, I needed to reinstall Docker. However once everything has been set in stone, I needed to move the contents of the default Docker data directory (/var/lib/docker) to a new partition and reconfigure accordingly.
Solution
To do this,
1) Stop the running service of Docker.
systemctl stop docker.service
2) Copy contents of Docker data to the new partition
mkdir -p /path/to/docker-data
rsync -aqxP /path/from/docker-data/ /path/to/docker-data
3) Configure the /etc/docker/daemon.json file to point to the new partition.
{
"debug": true,
"tls": true,
"tlscert": "/etc/docker/server-cert.pem",
"tlskey": "/etc/docker/server-key.pem",
"hosts": ["unix:///var/run/docker.sock","tcp://192.168.0.120:2376"],
"dns": ["192.168.0.60","8.8.8.8"],
"selinux-enabled": true,
"log-driver": "journald",
"data-root": "/path/to/docker-data", <<== Change this!!!
"iptables": false,
"storage-driver": "overlay2"
}
4) (If using RedHat / Fedora / CentOS with SELinux enabled) add the following commands
sudo semanage fcontext -a -s system_u -t container_var_lib_t "/path/to/docker-data(/.*)?"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/.*/config\.env"
sudo semanage fcontext -a -s system_u -t container_log_t "/path/to/docker-data/containers/.*/.*\.log"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/containers/.*/hostname"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/containers/.*/hosts"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/init(/.*)?"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/overlay(/.*)?"
sudo semanage fcontext -a -s system_u -t container_share_t "/path/to/docker-data/overlay2(/.*)?"
sudo restorecon -Rv /path/to/docker-data
5) Restart the Docker service
systemctl start docker.service
Hopefully this will make administration of Docker a little bit easier.
About the author |
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Tom Thorp is an IT Consultant living in Miami on Queensland's Gold Coast. With over 30+ years working in the IT industry, Tom's experience is a broad canvas. The IT services Tom provides to his clients, includes :
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