CentOS6.X下Docker安装笔记
2014-12-12 15:44
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(WJW)Docker安装笔记
[X] 一、禁用selinux
由于Selinux和LXC有冲突,所以需要禁用selinux.编辑/etc/selinux/config,设置两个关键变量.SELINUX=disabled SELINUXTYPE=targeted
[X] 二、安装Fedora EPEL源
rpm -ivh ./epel-release-6-8.noarch.rpm 或者: #yum install http://ftp.riken.jp/Linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
[X] 三、添加hop5.repo源
cp ./hop5.repo /etc/yum.repos.d 或者: #cd /etc/yum.repos.d #wget http://www.hop5.in/yum/el6/hop5.repo
[X] 四、安装Docker
yum安装
[X] 升级带aufs模块的3.10内核((可选)yum install kernel-ml-aufs kernel-ml-aufs-devel
修改grub的主配置文件/etc/grub.conf，设置default=0，表示第一个title下的内容为默认启动的kernel（一般新安装的内核在第一个位置）。
重启系统
reboot now,
然后执行
uname -r,查看是否已经是3.10内核!
[root@localhost ~]# uname -r
3.10.5-3.el6.x86_64
执行
grep aufs /proc/filesystems,查看内核是否支持aufs!
[root@localhost ~]# grep aufs /proc/filesystems
nodev aufs
[X] 安装docker
yum install redhat-lsb yum install iptables chkconfig ip6tables off chkconfig iptables off service ip6tables stop service iptables stop yum install device-mapper-libs yum install libcgroup* yum install docker-io
如果报错:
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
解决办法是编辑/etc/yum.repos.d/epel.repo，把基础的恢复，镜像的地址注释掉 #baseurl mirrorlist 改成 baseurl #mirrorlist 然后执行: yum clean all
============================================================================================================================================================================================================================================= Package Arch Version Repository Size ============================================================================================================================================================================================================================================= Installing: docker-io x86_64 1.2.0-3.el6 epel 4.2 M Installing for dependencies: lua-alt-getopt noarch 0.7.0-1.el6 epel 6.9 k lua-filesystem x86_64 1.4.2-1.el6 epel 24 k lua-lxc x86_64 1.0.6-1.el6 epel 15 k lxc x86_64 1.0.6-1.el6 epel 120 k lxc-libs x86_64 1.0.6-1.el6 epel 248 k Transaction Summary ============================================================================================================================================================================================================================================= Install 6 Package(s) Downloading Packages: (1/6): docker-io-1.2.0-3.el6.x86_64.rpm | 4.2 MB 00:02 (2/6): lua-alt-getopt-0.7.0-1.el6.noarch.rpm | 6.9 kB 00:00 (3/6): lua-filesystem-1.4.2-1.el6.x86_64.rpm | 24 kB 00:00 (4/6): lua-lxc-1.0.6-1.el6.x86_64.rpm | 15 kB 00:00 (5/6): lxc-1.0.6-1.el6.x86_64.rpm | 120 kB 00:00 (6/6): lxc-libs-1.0.6-1.el6.x86_64.rpm | 248 kB 00:00 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
rpm手工安装:
先执行rpm --nodeps -ev $(rpm -qa | grep -i 'device-mapper-libs-') rpm --nodeps -ev $(rpm -qa | grep -i 'device-mapper-') rpm --nodeps -ev $(rpm -qa | grep -i 'device-mapper-event-libs-') rpm --nodeps -ev $(rpm -qa | grep -i 'device-mapper-event-') rpm -ivh ./device-mapper-event-1.02.90-2.el6.x86_64.rpm ./device-mapper-event-libs-1.02.90-2.el6.x86_64.rpm ./device-mapper-1.02.90-2.el6.x86_64.rpm ./device-mapper-libs-1.02.90-2.el6.x86_64.rpm
再执行
rpm -ivh ./lxc-libs-1.0.6-1.el6.x86_64.rpm rpm -ivh ./lua-alt-getopt-0.7.0-1.el6.noarch.rpm rpm -ivh ./lua-filesystem-1.4.2-1.el6.x86_64.rpm rpm -ivh ./lua-lxc-1.0.6-1.el6.x86_64.rpm rpm -ivh ./lxc-1.0.6-1.el6.x86_64.rpm #6.4版本以下需要 rpm -ivh ./libcgroup-0.40.rc1-5.el6.x86_64.rpm rpm -ivh ./docker-io-1.3.2-2.el6.x86_64.rpm
[X] 五、初步验证docker
输入docker -h,如果有如下输出,就证明docker在形式上已经安装成功.
# docker -h Usage of docker: -D=false: Enable debug mode -H=[]: Multiple tcp://host:port or unix://path/to/socket to bind in daemon mode, single connection otherwise -api-enable-cors=false: Enable CORS headers in the remote API -b="": Attach containers to a pre-existing network bridge; use 'none' to disable container networking -bip="": Use this CIDR notation address for the network bridge's IP, not compatible with -b -d=false: Enable daemon mode -dns=[]: Force docker to use specific DNS servers -g="/var/lib/docker": Path to use as the root of the docker runtime -icc=true: Enable inter-container communication -ip="0.0.0.0": Default IP address to use when binding container ports -iptables=true: Disable docker's addition of iptables rules -p="/var/run/docker.pid": Path to use for daemon PID file -r=true: Restart previously running containers -s="": Force the docker runtime to use a specific storage driver -v=false: Print version information and quit
[X] 六 、启动docker服务:
service docker start #docker -d -H unix:///var/run/docker.sock
[X] 七 、查找映象:
docker search 映象名字
从index.docker.io搜寻所需镜像.
去https://index.docker.io获取镜像相关的信息.
[X] 八 、进入 Docker 容器:
创建vi /bin/docker-enter.sh
#!/bin/sh
if [ -e $(dirname "$0")/nsenter ]; then
# with boot2docker, nsenter is not in the PATH but it is in the same folder
NSENTER=$(dirname "$0")/nsenter
else
NSENTER=nsenter
fi
if [ -z "$1" ]; then
echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"
echo ""
echo "Enters the Docker CONTAINER and executes the specified COMMAND."
echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
else
PID=$(docker inspect --format "{{.State.Pid}}" "$1")
if [ -z "$PID" ]; then
exit 1
fi
shift
OPTS="--target $PID --mount --uts --ipc --net --pid --"
if [ -z "$1" ]; then
# No command given.
# Use su to clear all host environment variables except for TERM,
# initialize the environment variables HOME, SHELL, USER, LOGNAME, PATH,
# and start a login shell.
"$NSENTER" $OPTS su - root
else
# Use env to clear all host environment variables.
"$NSENTER" $OPTS env --ignore-environment -- "$@"
fi
fi加上可执行
chmod +x /bin/docker-enter.sh
运行
docker-enter.sh <container id>,这样就进入到指定的容器中!
[X] 附录:低版本的Redhat(6.3)可能要手动挂载cgroup
我们首选禁用cgroup对应服务cgconfig.service cgconfig stop # 关闭服务 chkconfig cgconfig off # 取消开机启动
然后挂载cgroup,可以命令行挂载
mount -t cgroup none /cgroup #仅本次有效
或者修改配置文件,编辑
/etc/fstab,加入
none /cgroup cgroup defaults 0 0
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