#升级操作系统，centos7直接升级到7.3
yum clean all
yum update
#升级内核
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y
grub2-set-default 0
reboot
#安装docker
wget https://download.docker.com/linux/centos/docker-ce.repo -P /etc/yum.repos.d/
yum install -y docker-ce
mkdir -p /data0/docker/var && ln -s /data0/docker/var /var/lib/docker
mkdir /etc/docker/
echo "
{
"storage-driver": "overlay2",
"storage-opts": [ "overlay2.override_kernel_check=true" ],
"registry-mirrors": ["https://pej3ico7.mirror.aliyuncs.com"],
"insecure-registries":["10.211.121.26:5000","10.211.121.9:5000"],
"live-restore" : false
}
" >> /etc/docker/daemon.json
systemctl start docker
关闭selinxu iptables networkmanager
需要注意/etc/resolve，关闭networkmanager后无法正常使用域名访问。
报错：
level=error msg="[graphdriver] prior storage driver devicemapper failed: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can‘t set cookie dm_task_set_cookie failed"
Aug 17 08:35:42 cephnode2 dockerd: Error starting daemon: error initializing graphdriver: devmapper: Base Device UUID and Filesystem verification failed: devicemapper: Can‘t set cookie dm_task_set_cookie failed
解决：
echo ‘y‘ | sudo dmsetup udevcomplete_all
docker 重启后：
kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
rancher 灾备测试：
26server 删除重启 外挂数据库 ，重新启动server进程， 创建的swarm 业务不受影响。