Centos7安装docker

参考 http://www.linuxidc.com/Linux/2014-12/110034.htm

cd /etc/yum.repos.d

wget https://download.docker.com/linux/centos/docker-ce.repo

curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

安装

yum -y install docker

[root@localhost ~]# docker version
Client:
Version: 1.12.6
API version: 1.24
Package version: docker-1.12.6-55.gitc4618fb.el7.centos.x86_64
Go version: go1.8.3
Git commit: c4618fb/1.12.6
Built: Thu Sep 21 22:33:52 2017
OS/Arch: linux/amd64
Cannot connect to the Docker daemon. Is the docker daemon running on this host?   （没启动导致）

启动

systemctl start docker.service

systemctl enable docker.service

 

[root@localhost ~]# docker info
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 1.12.6
Storage Driver: devicemapper
Pool Name: docker-8:3-101859532-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 11.8 MB
Data Space Total: 107.4 GB
Data Space Available: 47.25 GB
Metadata Space Used: 581.6 kB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.147 GB
Thin Pool Minimum Free Space: 10.74 GB
Udev Sync Supported: true
Deferred Removal Enabled: true
Deferred Deletion Enabled: true
Deferred Deleted Device Count: 0
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.140-RHEL7 (2017-05-03)
Logging Driver: journald
Cgroup Driver: systemd
Plugins:
Volume: local
Network: null host bridge overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Security Options: seccomp selinux
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 1
Total Memory: 976.3 MiB
Name: localhost.localdomain
ID: B2TQ:UDTK:F4S4:PI6Z:FWWW:UWZE:KN6W:XE52:3HXY:74GV:SZIR:GJWW
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Insecure Registries:
127.0.0.0/8
Registries: docker.io (secure)

 

下载centos

docker pull docker.io/centos

确认以下载的镜像

docker images centos

 

 

 

无法启动docker  报    Failed to start Docker Application Container Engine.报错 重装docker都无法解决，就要运行下面脚本   https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount

 

#!/bin/sh
# Copyright 2011 Canonical, Inc
#           2014 Tianon Gravi
# Author: Serge Hallyn <serge.hallyn@canonical.com>
#         Tianon Gravi <tianon@debian.org>
set -e

# for simplicity this script provides no flexibility

# if cgroup is mounted by fstab, don't run
# don't get too smart - bail on any uncommented entry with 'cgroup' in it
if grep -v '^#' /etc/fstab | grep -q cgroup; then
    echo 'cgroups mounted from fstab, not mounting /sys/fs/cgroup'
    exit 0
fi

# kernel provides cgroups?
if [ ! -e /proc/cgroups ]; then
    exit 0
fi

# if we don't even have the directory we need, something else must be wrong
if [ ! -d /sys/fs/cgroup ]; then
    exit 0
fi

# mount /sys/fs/cgroup if not already done
if ! mountpoint -q /sys/fs/cgroup; then
    mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
fi

cd /sys/fs/cgroup

# get/mount list of enabled cgroup controllers
for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
    mkdir -p $sys
    if ! mountpoint -q $sys; then
        if ! mount -n -t cgroup -o $sys cgroup $sys; then
            rmdir $sys || true
        fi
    fi
done

# example /proc/cgroups:
#  #subsys_name    hierarchy    num_cgroups    enabled
#  cpuset    2    3    1
#  cpu    3    3    1
#  cpuacct    4    3    1
#  memory    5    3    0
#  devices    6    3    1
#  freezer    7    3    1
#  blkio    8    3    1

# enable cgroups memory hierarchy, like systemd does (and lxc/docker desires)
# https://github.com/systemd/systemd/blob/v245/src/core/cgroup.c#L2983
# https://bugs.debian.org/940713
if [ -e /sys/fs/cgroup/memory/memory.use_hierarchy ]; then
    echo 1 > /sys/fs/cgroup/memory/memory.use_hierarchy
fi

exit 0

systemctl start docker.service

 

 

修改/usr/lib/systemd/system/docker.service文件后导致docker无法重启
从其他机器拷贝一个文件再重启
cp  /usr/lib/systemd/system/docker.service  n2:/usr/lib/systemd/system/docker.service  
systemctl daemon-reload && systemctl restart docker.service