在centos7手动安装docker-ce 19.03.13

本文旨在于centos7手动安装docker-ce 19.03.13，了解其构成

环境

1. centos7
2. docker-ce 19.03.13

安装

1. 从官网下载tgz文件：

wget http://docker-release-purple-prod.s3-website-us-east-1.amazonaws.com/linux/static/stable/x86_64/docker-19.03.13.tgz

2. 解压

tar xzvf docker-19.03.13.tgz

3. 将解压后的文件移动至环境变量目录

cp docker/* /usr/bin/

4. 运行docker守护进程

dockerd &

• 这是临时运行方式。想要持久运行并开机启动的话，就要选择做成service方式。

做成service

1. 创建/usr/lib/systemd/system/docker.socket文件

[Unit]
Description=Docker Socket for the API
PartOf=docker.service

[Socket]
ListenStream=/var/run/docker.sock
SocketMode=0660
SocketUser=root
SocketGroup=root

[Install]
WantedBy=sockets.target

2. 创建/usr/lib/systemd/system/containerd.service文件

[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target

[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/bin/containerd

Type=notify
Delegate=yes
KillMode=process
Restart=always
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=1048576
# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity

[Install]
WantedBy=multi-user.target

启动containerd

systemctl daemon-reload
systemctl enable containerd.service
systemctl start containerd.service
systemctl status containerd.service

3. 创建/usr/lib/systemd/system/docker.service文件

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
BindsTo=containerd.service
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always

# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3

# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s

# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity

# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
TasksMax=infinity

# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes

# kill only the docker process, not all processes in the cgroup
KillMode=process

[Install]
WantedBy=multi-user.target

启动docker

systemctl daemon-reload
systemctl enable docker.service
systemctl start docker.service
systemctl status docker.service