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Systemctl
=======================
For RHEL 7+ distributions, install ‘docker-engine’ from the dockerproject repository. Older versions of docker-engine and docker-machine used different paths for the systemctl config files and when upgraded did not always convert cleanly from the older location.
Docker is changing very quickly, its important to keep up to date. Most linux distributions are behind on docker updates. Recommend using the Docker Repostory appropriate to your distribution.
Example of /etc/yum.repos.d/docker.conf
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
With the above in place install docker with
yum install docker-engine
Reference the full docs.
https://docs.docker.com/engine/admin/systemd/
Locate your docker.conf file Run systemctl to get the current location of docker.conf Note: earlier versions of docker and docker-engine, and docker-machine placed the config file in /etc/ so you might have both. Use the one systemctl shows as the active configuation.
Note that the "Drop-In" will not exist on a clean install, only after configuring docker.
BEFORE
[root@z600 system]# systemctl status docker
docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset:disabled)
Active: active (running) since Sun 2017-01-15 11:01:39 EST; 5 days ago
Docs: https://docs.docker.com
AFTER
[root@z600 system]# systemctl status docker
docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset:disabled)
Drop-In: /etc/systemd/system/docker.service.d
└─docker.conf
Active: active (running) since Sun 2017-01-15 11:01:39 EST; 5 days ago
Docs: https://docs.docker.com
There is an existing file you should not edit In this case its :
/usr/lib/systemd/system/docker.service
Instead use the 'drop in' feature of systemctl and add a new file to the dropin directory Consult systemctl to find what the directory is
may be :
/lib/systemd/system/docker.service.d
/usr/lib/systemd/system/docker.service.d
/etc/systemd/system/docker.service.d
You can call it anything, I suggest 'docker.conf'
Edit docker.conf, in this case its
/etc/systemd/system/docker.service.d/docker.conf
The following is an example Make sure you have "ExecStart=" as the first so that it will overwrite the default.
Note: ExecStart is line wrapped for readability, it should be all on one line.
ExecStart=
ExecStart=/usr/bin/dockerd
-H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock
--storage-driver overlay2
--tlsverify --tlscacert /etc/docker/ca.pem
--tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem
--label provider=generic
--bip=10.250.0.1/16
#
MountFlags=slave
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
Environment=
--bip=<subnet>
--tlsverify --tlscacert /etc/docker/ca.pem
--tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem
See Networking for details on choosing the right values
--storage-driver overlay2
See Storage for details