美文网首页
无损分区,调整Liunx服务器分区大小,简明扼要

无损分区,调整Liunx服务器分区大小,简明扼要

作者: 李庆喜 | 来源:发表于2018-01-25 17:35 被阅读0次

    因为开始装的服务器用的自动lvm,后来发现home下分区太大了,/分区太小。zabbix报警空间已用80%,所以必须要压缩home分区给/目录

    感觉乱乱的,整理一下使用的命令按顺序和思路,简明扼要后面就不用看了:

    1.umount /home               ###如果发现busy不能卸载就fuser -m /home查看一下是什么进程在占用,然后kill -9 杀掉
    2.resize2fs -p /dev/mapper/VolGroup-lv_home 20G              ###先设置一下home的大小,做这部的时候会提醒让先运行下面的命令进行检查
    3.e2fsck -f /dev/mapper/VolGroup-lv_home                           ###强制检查一下磁盘并修复错误
    4.resize2fs -p /dev/mapper/VolGroup-lv_home 20G              ###再次运行这个命令把home大小设置为20G
    5.lvreduce -L 20G /dev/mapper/VolGroup-lv_home               ###收缩逻辑卷空间为20G
    6.mount /home                                                                       ###并du -f 查看一下home 大小分配是否成功                                                                             
    7.lvextend -l +100%FREE /dev/mapper/VolGroup-lv_root     ###把剩余的所有空间都分配给/目录
    8.resize2fs -p /dev/mapper/VolGroup-lv_root                         ###执行调整根目录的空间大小,并耐心等待,不要操作
    9.#等待一段时间后就成功了 df -h看看吧
    
    • 首先:以防万一先备份好/home下的文件,然后umount /home分区
      如果发现umount /home分区的时候提示busy说明有进程在占用home分区
      建议用 fuser -m /home命令进行查看一下,然后kill -9 杀掉进程。
    • 然后,
    umount /home
    [root@localhost ~]# umount /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root   50G   40G  7.4G  85% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    [root@localhost ~]# resize2fs -p /dev/mapper/ 
    control           VolGroup-lv_home  VolGroup-lv_root  VolGroup-lv_swap  
    [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G
    resize2fs 1.41.12 (17-May-2010)
    请先运行 'e2fsck -f /dev/mapper/VolGroup-lv_home'.
    
    [root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home
    e2fsck 1.41.12 (17-May-2010)
    第一步: 检查inode,块,和大小
    第二步: 检查目录结构
    第3步: 检查目录连接性
    Pass 4: Checking reference counts
    第5步: 检查簇概要信息
    /dev/mapper/VolGroup-lv_home: 124/13942784 files (8.1% non-contiguous), 966453/55744512 blocks
    [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G
    resize2fs 1.41.12 (17-May-2010)
    Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks.
    Begin pass 2 (max = 32873)
    正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    Begin pass 3 (max = 1702)
    正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    Begin pass 4 (max = 22)
    正在更新inode引用       XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.
    
    [root@localhost ~]# mount /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root   50G   40G  7.4G  85% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    

    这样就成功把/home分区成功调整到20G大小了,接下来我们进行操作,把剩下的空间分给根目录

     [root@localhost ~]# lvextend -l +100%FREE /dev/mapper/VolGroup-lv_rootlvreduce -L 20G /dev/mapper/VolGroup-lv_home
      WARNING: Reducing active and open logical volume to 20.00 GiB
      THIS MAY DESTROY YOUR DATA (filesystem etc.)
    Do you really want to reduce lv_home? [y/n]: y
      Reducing logical volume lv_home to 20.00 GiB
      Logical volume lv_home successfully resized
    
    [root@localhost ~]# lvextend -l +100%FREE /dev/mapper/VolGroup-lv_root
      Extending logical volume lv_root to 242.65 GiB
      Logical volume lv_root successfully resized
    [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_root 
    resize2fs 1.41.12 (17-May-2010)
    Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
    old desc_blocks = 4, new_desc_blocks = 16
    Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 63608832 (4k) blocks.
    然后就是漫长的等待
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  114G   40G   69G  37% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  117G   40G   71G  36% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    [root@localhost ~]# df -h
    Filesystem                    Size  Used Avail Use% Mounted on
    /dev/mapper/VolGroup-lv_root  118G   40G   73G  36% /
    tmpfs                          16G     0   16G   0% /dev/shm
    /dev/sda1                     485M   39M  421M   9% /boot
    /dev/mapper/VolGroup-lv_home   20G  342M   19G   2% /home
    

    可以看到正在扩容,完事

    相关文章

      网友评论

          本文标题:无损分区,调整Liunx服务器分区大小,简明扼要

          本文链接:https://www.haomeiwen.com/subject/wftbaxtx.html