LinuxProbe/ 疑问ABC

1 ext4格式lv扩展。扩展之前忘记umount，导致e2fscheck出错（红字部分）

 [root@localhost ~]# blkid | grep vo

/dev/mapper/juanzu-vo: UUID="3e376bb6-d29a-4e7b-8ad4-fe0968d5f1a6" TYPE="ext4"

[root@localhost ~]# 忘记umount

[root@localhost ~]# lvextend -L 300M /dev/juanzu/vo

  Extending logical volume vo to 300.00 MiB

  Logical volume vo successfully resized

[root@localhost ~]# e2fsck -f /dev/juanzu/vo

e2fsck 1.42.9 (28-Dec-2013)

/dev/juanzu/vo is mounted.

e2fsck: Cannot continue, aborting.

[root@localhost ~]# umount /dev/juanzu/vo

[root@localhost ~]#

[root@localhost ~]# e2fsck -f /dev/juanzu/vo

e2fsck 1.42.9 (28-Dec-2013)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/juanzu/vo: 11/20480 files (9.1% non-contiguous), 8240/81920 blocks

[root@localhost ~]#

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解决办法：

1，reboot无效

2，OK

刘遄 2018/12/17 15:33:58

这个没关系，只要能正常挂载就行

刘 2018/12/17 15:34:01

数据没有丢失就行

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2 设置crond开机启动时，是否考虑登录哪个账户？比如在root时设置开机启动，那在用户natasha账户内的crond任务是否也会开机启动？

[root@station tmp]# crontab -e -u natasha

#root账户下编辑natasha用户的crond任务

no crontab for natasha - using an empty one

crontab: installing new crontab

 [root@station tmp]# crontab -l -u natasha

23 14 * * * /bin/echo hiya

[root@station tmp]#

[root@station tmp]# systemctl restart crond.service

[root@station tmp]# systemctl enable crond.service

#root账户下设置crond开机启动。那么上面新建的natasha账户的crond任务是否会在开机时自动启动？

[root@station tmp]#

[root@station tmp]# su - natasha

[natasha@station ~]$ systemctl restart crond.service

Failed to issue method call: Access denied

[natasha@station ~]$

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解决方法：

 reboot后发现root和natasha账户的crond都是开机启动的。

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