Paramiko exec_command 不适用于 mkfs？ 问题排查步骤

如何解决Paramiko exec_command 不适用于 mkfs？ 问题排查步骤

使用 Paramiko 执行以下 bash 的一些问题：

def format_disk(self,device,size,dformat,mount,name):
        stdin_,stdout_,stderr_ = self.client.exec_command(f"pvcreate {device};" \
        f"vgcreate {name}-vg {device};" \
        f"lvcreate -L {size} --name {name}-lv {name}-vg;" \
        f"mkfs.{dformat} /dev/{name}-vg/{name}-lv;" \
        f"mkdir {mount};" \
        f"echo '/dev/{name}-vg/{name}-lv {mount} {dformat} defaults 0 0' >> /etc/fstab")
        print(f"mkfs.{dformat} /dev/{name}-vg/{name}-lv;")

打印语句输出：mkfs.ext4 /dev/first_try-vg/first_try-lv; 如果我将这个确切的命令复制并粘贴到服务器上，则不会出现错误，并且会按预期格式化磁盘。

问题排查步骤

运行python脚本前的服务器：

ls: cannot access /first_try: No such file or directory
[root@localhost ~]# vgs
[root@localhost ~]# lvs
[root@localhost ~]# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Thu Feb 25 07:32:51 2021
#
# Accessible filesystems,by reference,are maintained under '/dev/disk'
# See man pages fstab(5),findfs(8),mount(8) and/or blkid(8) for more info
#
UUID=38b7e96a-71e5-4089-a348-bd23828f9dc8 /                       xfs     defaults        0 0
UUID=72fd2a6a-85db-4596-9fc2-6604d0d865a3 /boot                   xfs     defaults        0 0

运行python脚本后的服务器：

[root@localhost ~]# ls /first_try/
[root@localhost ~]# vgs
  VG           #PV #LV #SN Attr   VSize   VFree  
  first_try-vg   1   1   0 wz--n- <20.00g <15.00g
[root@localhost ~]# lvs
  LV           VG           Attr       LSize Pool Origin Data%  Meta%  Move Log cpy%sync Convert
  first_try-lv first_try-vg -wi-a----- 5.00g                                                    
[root@localhost ~]# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Thu Feb 25 07:32:51 2021
#
# Accessible filesystems,mount(8) and/or blkid(8) for more info
#
UUID=38b7e96a-71e5-4089-a348-bd23828f9dc8 /                       xfs     defaults        0 0
UUID=72fd2a6a-85db-4596-9fc2-6604d0d865a3 /boot                   xfs     defaults        0 0
/dev/first_try-vg/first_try-lv /first_try ext4 defaults 0 0
[root@localhost ~]# mount -a
mount: wrong fs type,bad option,bad superblock on /dev/mapper/first_try--vg-first_try--lv,missing codepage or helper program,or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

来自 mount -a 的错误表明磁盘未格式化。 如果我手动格式化磁盘并运行 mount -a 它可以工作。

示例：

[root@localhost ~]# mkfs.ext4 /dev/first_try-vg/first_try-lv
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks,Stripe width=0 blocks
327680 inodes,1310720 blocks
65536 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1342177280
40 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

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): mdone
Writing superblocks and filesystem accounting information: done 

[root@localhost ~]# mount -a
[root@localhost ~]# df -h
Filesystem                               Size  Used Avail Use% Mounted on
/dev/sda3                                 18G  4.7G   14G  27% /
devtmpfs                                 471M     0  471M   0% /dev
tmpfs                                    487M     0  487M   0% /dev/shm
tmpfs                                    487M  8.4M  478M   2% /run
tmpfs                                    487M     0  487M   0% /sys/fs/cgroup
/dev/sda1                                297M  147M  151M  50% /boot
tmpfs                                     98M   12K   98M   1% /run/user/42
tmpfs                                     98M     0   98M   0% /run/user/0
/dev/mapper/first_try--vg-first_try--lv  4.8G   20M  4.6G   1% /first_try

解决方法

Pariminko 无法处理 mkfs 的输出。我将命令更改为使用 -q 安静标志，并且能够成功运行脚本。

新命令 mkfs -q -t {dformat} /dev/{name}-vg/{name}-lv