OpenStack-Rocky 灾备

环境

• 操作系统: CentOS7.6

• OpenStack: Rocky

• Ceph: luminous

• 数据库集群：MariaDB Galera Cluster

为了便于区别 Openstack 集群和灾备服务器，将 OpenStack 集群服务器简称为 openstack，灾备服务器简称为 backup

部署灾备服务器

ceph 备份

• backup 正常部署 ceph

• ceph 开启日志功能

  RBD 需要启用exclusive-lock和journaling属性,可以手动创建时启用，也可以修改配置文件，创建时自动启用。

  [all]

  # 修改配置文件,开启自动启动功能
  crudini --set /etc/ceph/ceph.conf 'global' 'rbd default features' '125'
  systemctl restart ceph.target

• backup 创建 pool

  [backup]

  ceph osd pool create images 64
  ceph osd pool create vms 64
  ceph osd pool create volumes 64

• 拷贝配置文件和密钥到 backup

  [openstack]

  scp /etc/ceph/ceph.conf root@backup_ip:/etc/ceph/openstack.conf
  scp /etc/ceph/ceph.client.admin.keyring root@backup_ip:/etc/ceph/openstack.client.admin.keyring

• 修改 ceph 配置文件所有者

  chown ceph:ceph /etc/ceph/

• pool 启用 mirror

  [all]

  rbd mirror pool enable images pool
  rbd mirror pool enable vms pool
  rbd mirror pool enable volumes pool

• 添加 peer

  [backup]

  rbd mirror pool peer add images client.admin@openstack
  rbd mirror pool peer add vms client.admin@openstack
  rbd mirror pool peer add volumes client.admin@openstack

• 防火墙放行 backup IP

  [master]

  firewall-cmd --permanent --zone=trusted --add-source=192.168.2.10
  firewall-cmd --zone=trusted --add-source=192.168.2.10

• 启动ceph-rbd-mirror服务

  [backup]

  yum install -y rbd-mirror
  systemctl start [email protected]
  systemctl enable [email protected]
  systemctl status [email protected]

• 查看同步状态

  rbd mirror pool status images
  rbd mirror pool status vms
  rbd mirror pool status volumes

MariaDB Galera Cluster 备份

• 安装软包

  [backup]

  yum install -y centos-release-openstack-rocky
  yum install -y mariadb mariadb-galera-server mariadb-galera-common galera rsync

• 修改配置文件

  [backup]

  cat > /etc/my.cnf.d/openstack.cnf << EOF
  [mysqld]
  bind-address = 0.0.0.0
  
  default-storage-engine = innodb
  innodb_file_per_table
  max_connections = 4096
  collation-server = utf8_general_ci
  character-set-server = utf8
  
  wsrep_provider = /usr/lib64/galera/libgalera_smm.so
  wsrep_cluster_address = "gcomm://controller1,controller2,controller3"
  wsrep_node_name = backup
  wsrep_node_address = 192.168.2.10
  
  EOF

  注意：根据环境修改 wsrep_cluster_address , wsrep_node_name , wsrep_node_address

• 启动服务

  [backup]

  systemctl restart mariadb.service
  systemctl enabel mariadb.service
  systemctl status mariadb.service

• 检查同步

  [backup]

  mysql -e 'SHOW STATUS LIKE "wsrep%";'

  灾备恢复

  根据之前的网络架构，重新部署 OpenStack 集群，再进行灾备恢复

  注意：不要上传任何镜像，创建虚拟机和卷

  ceph 恢复

• 确认 images,vms,volumes 没有文件

  [openstack]

  rbd ls images
  rbd ls vms
  rbd ls volumes

• 提升等级

  [backup]

  rbd mirror pool promote --force images
  rbd mirror pool promote --force vms
  rbd mirror pool promote --force volumes

• 开启 ceph 日志功能

  [openstack]

  # 修改配置文件,开启自动启动功能
  crudini --set /etc/ceph/ceph.conf 'global' 'rbd default features' '125'
  systemctl restart ceph.target

• 拷贝密钥和配置文件

  [backup]

  scp /etc/ceph/ceph.conf root@openstack_ip:/etc/ceph/backup.conf
  scp /etc/ceph/ceph.client.admin.keyring root@openstack_ip:/etc/ceph/backup.client.admin.keyring

  • 修改 ceph 配置文件所有者

    [openstack]

    chown ceph:ceph /etc/ceph/

  • pool 启用 mirror

    [openstack]

    rbd mirror pool enable images pool
    rbd mirror pool enable vms pool
    rbd mirror pool enable volumes pool

  • 添加 peer

    [openstack]

    rbd mirror pool peer add images client.admin@backup
    rbd mirror pool peer add vms client.admin@backup
    rbd mirror pool peer add volumes client.admin@backup

  • 启动ceph-rbd-mirror服务

    [openstack]

    yum install -y rbd-mirror
    systemctl start [email protected]
    systemctl enable [email protected]
    systemctl status [email protected]

  • 查看同步状态

    [openstack]

    rbd mirror pool status images
    rbd mirror pool status vms
    rbd mirror pool status volumes

MariaDB Galera Cluster 恢复

• 停止服务，以主节点方式启动

  [backup]

  systemctl stop mariadb.service
  galera_new_cluster

• 导出数据库并拷贝到 openstack 集群服务器

  [backup]

  mysqldump --all-databases > ~/all.sql
  scp ~/all.sql root@openstack_ip:~/
  systemctl stop mariadb.service

• 替换 sql 中的 ceph fsid

  [openstack]

  # 查看FSID
  ceph fsid
  # 替换FSID，将上条命令的结果，替换到FSID处
  sed -i 's/rbd:\/\/.\{36\}/rbd:\/\/FSID/g' ~/all.sql

• 清空数据库

  [openstack]

  systemctl stop mariadb.service
  rm -rf /var/lib/mysql/*

• 导入 sql

  [openstack]

  # 启动数据库
  galera_new_cluster
  # 登录数据库
  mysql
  # 导入sql
  source ~/all.sql