ansible作业 -- 作软raid5

step1：环境准备：raid5至少需要三块硬盘，因此在虚拟机中，增加4块硬盘，其中三块用来做活动盘，一块用来做热备盘

step2：直接对4块硬盘做raid，其中一块硬盘为热备盘；

[root@node02 ~]# mdadm -C /dev/md5 -a yes -l 5 -n 3 -x 1 /dev/sd[b,c,d,e]

说明：-C:创建模式；

-a {yes|no}自动(在/dev/md5)创建对应的设备，

-l: 指明要创建的级别

-n: 使用#个块设备来创建此raid

-x:当前阵列中热备盘只有#块

查看raid5状态

[root@node02 ~]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] 
md5 : active raid5 sdd[4] sde[3](S) sdc[1] sdb[0]
      41910272 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]      
unused devices: <none>
[root@node02 ~]# mdadm -D /dev/md5
/dev/md5:
           Version : 1.2
     Creation Time : Tue Aug 17 16:44:14 2021
        Raid Level : raid5
        Array Size : 41910272 (39.97 GiB 42.92 GB)
     Used Dev Size : 20955136 (19.98 GiB 21.46 GB)
      Raid Devices : 3
     Total Devices : 4
       Persistence : Superblock is persistent
       Update Time : Tue Aug 17 16:46:00 2021
             State : clean 
    Active Devices : 3
   Working Devices : 4
    Failed Devices : 0
     Spare Devices : 1
            Layout : left-symmetric
        Chunk Size : 512K
Consistency Policy : resync
              Name : node02:5  (local to host node02)
              UUID : c42a9c5f:415080f9:e2c7cc23:ab17f6e1
            Events : 28
    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8       32        1      active sync   /dev/sdc
       4       8       48        2      active sync   /dev/sdd
       3       8       64        -      spare   /dev/sde

step3：添加raid5到raid配置文件中/etc/mdadm.conf;

[root@node02 ~]# echo DEVICE /dev/sd[b,c,d,e] >> /etc/mdadm.conf
[root@node02 ~]# mdadm -Ds >> /etc/mdadm.conf 
[root@node02 ~]# cat /etc/mdadm.conf 
DEVICE /dev/sdb /dev/sdc /dev/sdd /dev/sde
ARRAY /dev/md5 metadata=1.2 spares=1 name=node02:5 UUID=8881bf3f:f72936c3:49de2bfd:7b807327

step4: 格式化磁盘;

[root@node02 ~]# mkfs.ext4 /dev/md5

mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=256 blocks
2621440 inodes, 10477568 blocks
523878 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2157969408
320 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
    4096000, 7962624
Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done   

step5：创建挂载点并挂载磁盘;

[root@node02 ~]# mkdir /raid5
[root@node02 ~]# mount /dev/md5 /raid5/
[root@node02 ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda2      xfs       100G  4.5G   96G   5% /
devtmpfs       devtmpfs  898M     0  898M   0% /dev
tmpfs          tmpfs     912M     0  912M   0% /dev/shm
tmpfs          tmpfs     912M  9.1M  903M   1% /run
tmpfs          tmpfs     912M     0  912M   0% /sys/fs/cgroup
/dev/sda6      xfs        50G   33M   50G   1% /data
/dev/sda5      xfs       2.0G   37M  2.0G   2% /home
/dev/sda1      ext4      976M  145M  765M  16% /boot
tmpfs          tmpfs     183M   28K  183M   1% /run/user/0
/dev/sr0       iso9660   8.1G  8.1G     0 100% /run/media/root/CentOS 7 x86_64
/dev/md5       ext4       40G   49M   38G   1% /raid5

step6：添加开机自动挂载;

[root@node02 ~]# echo "/dev/md5 /raid5 ext4 defaults 0 0" >> /etc/fstab

reboot重启，测试开机是否自动挂载，raid5是否正常工作。

roles：

mkdir -p mdadm_raid5/{tasks,files,templates}
tasks
- name: creat raid5
  shell: mdadm -C /dev/md5 -a yes -l 5 -n 3 -x 1 /dev/sd[b,c,d,e]
- name: set raid5                 
  template: src=mdadm.sh dest=~/mdadm.sh  
- name: add raid5
  shell: sh mdadm.sh
- name: format md5
  shell: mkfs.ext4 /dev/md5
- name: mount md5
  mount:
    path: /raid5/
    src: /dev/md5
    fstype: ext4
    state: mounted 
- name:  set add_fstab              
  template: src=add_fstab.sh dest=~/add_fstab.sh     
- name: add_fstab
  shell: sh add_fstab.sh                                

 编写templates/mdadm.sh,add_fstab.sh

vim templates/mdadm.sh
#!/bin/bash
echo DEVICE /dev/sd[b,c,d,e] >> /etc/mdadm.conf
mdadm -Ds >> /etc/mdadm.conf                          

vim templates/add_fstab.sh
#!/bin/bash
echo "/dev/md5 /raid5 ext4 defaults 0 0" >> /etc/fstab

编写mdadm_raid5.yml

vi mdadm_raid5.yml
- hosts: websrvs
remote_user: root
roles:
  - mdadm_raid5

运行

ansible-playbook install_docker_ce.yml

附正确删除raid5方法：

[root@node02 ~]# umount /dev/md5      #先卸载阵列
[root@node02 ~]# df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda2      104806400 4701492 100104908   5% /
devtmpfs          918572       0    918572   0% /dev
tmpfs             933524       0    933524   0% /dev/shm
tmpfs             933524    9292    924232   1% /run
tmpfs             933524       0    933524   0% /sys/fs/cgroup
/dev/sda6       52403200   32944  52370256   1% /data
/dev/sda5        2086912   36948   2049964   2% /home
/dev/sda1         999320  148160    782348  16% /boot
tmpfs             186708      28    186680   1% /run/user/0
/dev/sr0         8490330 8490330         0 100% /run/media/root/CentOS 7 x86_64
[root@node02 ~]# mdadm -S /dev/md5                  #停止raid运行
mdadm: stopped /dev/md5                            
[root@node02 ~]# mdadm --misc --zero-superblock /dev/sd[bcde]   #删除磁盘
[root@node02 ~]# rm -f /etc/mdadm.conf          #删除配置文件

 

fstab配置的自动挂载也需要删除