Amit Agarwal Linux Blog

Set some disk params to be safe

2013-09-05 3 min read Fedora Linux

It is always “Better safe than sorry” so, here are some things you
should do..

First check fstab, if you have partitions other than root then use UUID instead of device:

UUID=a8f13a0d-3f1f-42e4-b076-f44b4163306c /mnt/Backup     ext4 defaults,relatime 1 2

Then entries for all your mounts should be like above.
Points to note here :

Disk is mounted using the UUID and not with /dev/sdXX. This ensures
that even if your disk ids change, you will be able to mount them. To
get the partition UUID, you can execute :

Continue reading
Booting FileSystem Fsck Fstab Linux Mount (Unix) Universally Unique Identifier UUID

Script to add all the partitions to the fstab.

2010-06-24 5 min read Bash Fedora

I wrote a simple script today to get all the partitions on all the disks and then create <a class="zem_slink freebase/en/fstab" title="Fstab" rel="wikipedia" href="http://en.wikipedia.org/wiki/Fstab">fstab entry with them. The script also gets the <a class="zem_slink freebase/en/universally_unique_identifier" title="Universally Unique Identifier" rel="wikipedia" href="http://en.wikipedia.org/wiki/Universally_Unique_Identifier">UUID and uses the same to make the entry 🙂

  <td>
    <div class="bash codecolorer">
      <span class="co0">#!/bin/bash -</span><br /> <span class="co0">#===============================================================================</span><br /> <span class="co0">#</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;FILE: &nbsp;mount_add_all.sh</span><br /> <span class="co0">#</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp; USAGE: &nbsp;./mount_add_all.sh</span><br /> <span class="co0">#</span><br /> <span class="co0"># &nbsp; DESCRIPTION: &nbsp;Find all the <a class="zem_slink freebase/en/disk_partitioning" title="Disk partitioning" rel="wikipedia" href="http://en.wikipedia.org/wiki/Disk_partitioning">disk partitions</a> and all those that are not present</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; in the fstab.</span><br /> <span class="co0">#</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; OPTIONS: &nbsp;---</span><br /> <span class="co0"># &nbsp;REQUIREMENTS: &nbsp;---</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;BUGS: &nbsp;---</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp; NOTES: &nbsp;---</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; &nbsp;AUTHOR: &nbsp;<a class="zem_slink" title="Digital Inspiration" rel="homepage" href="http://amit-agarwal.co.in">Amit Agarwal</a> (AKA), amit.agarwal@amit-agarwal.co.in</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; COMPANY: &nbsp;Individual</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; VERSION: &nbsp;1.0</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp; CREATED: &nbsp;06/19/2010 10:44:34 PM IST</span><br /> <span class="co0"># &nbsp; &nbsp; &nbsp;REVISION: &nbsp;0.1</span><br /> <span class="co0">#===============================================================================</span><br /> <span class="re2">file</span>=<span class="st0">"/tmp/fstab"</span><br /> <span class="re2">disk_types</span>=<span class="br0">&#40;</span>hd sd<span class="br0">&#41;</span><br /> <span class="re2">count</span>=<span class="co1">${#disk_types}</span><br /> <br /> find_disks <span class="br0">&#40;</span><span class="br0">&#41;</span><br /> <span class="br0">&#123;</span><br /> <span class="kw3">echo</span> <span class="co1">${#disk_types}</span> <span class="re1">$count</span><br /> <span class="kw1">for</span> i <span class="kw1">in</span> $<span class="br0">&#40;</span><span class="kw2">seq</span> <span class="nu0">1</span> <span class="re1">$count</span><span class="br0">&#41;</span><br /> <span class="kw1">do</span><br /> <span class="br0">&#40;</span><span class="br0">&#40;</span> <span class="re2">j</span>=i-<span class="nu0">1</span> <span class="br0">&#41;</span><span class="br0">&#41;</span><br /> <span class="kw3">echo</span> <span class="re1">$i</span> <span class="re1">$j</span><br /> <span class="kw3">echo</span> <span class="re1">$j</span> <span class="co1">${disk_types[0]}</span> <span class="co1">${disk_types[1]}</span><br /> disk_array<span class="br0">&#91;</span><span class="re1">$j</span><span class="br0">&#93;</span>=$<span class="br0">&#40;</span><span class="kw2">ls</span> <span class="sy0"><</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/device_file_system"</span> <span class="re2">title</span>=<span class="st0">"Device file"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki/Device_file"</span><span class="sy0">>/</span>dev<span class="sy0"></</span>a<span class="sy0">>/</span><span class="co1">${disk_types[$j]}</span><span class="br0">&#91;</span>a-z<span class="br0">&#93;</span><span class="br0">&#41;</span><br /> <span class="kw3">echo</span> <span class="co1">${disk_array[$j]}</span><br /> <span class="kw1">done</span><br /> <span class="br0">&#125;</span> &nbsp; &nbsp;<span class="co0"># ---------- &nbsp;end of function find_disks &nbsp;----------</span><br /> <br /> find_partitions <span class="br0">&#40;</span><span class="br0">&#41;</span><br /> <span class="br0">&#123;</span><br /> <span class="kw3">echo</span> <span class="st0">"In find_partitions"</span><br /> <span class="re2">l</span>=<span class="nu0"></span><br /> <span class="re2">count</span>=<span class="co1">${#disk_types}</span><br /> <span class="kw1">for</span> i <span class="kw1">in</span> $<span class="br0">&#40;</span><span class="kw2">seq</span> <span class="nu0">1</span> <span class="re1">$count</span><span class="br0">&#41;</span><br /> <span class="kw1">do</span><br /> <span class="br0">&#40;</span><span class="br0">&#40;</span><span class="re2">j</span>=i-<span class="nu0">1</span><span class="br0">&#41;</span><span class="br0">&#41;</span><br /> <span class="kw1">for</span> k <span class="kw1">in</span> <span class="co1">${disk_array[$i]}</span><br /> <span class="kw1">do</span><br /> <span class="kw3">echo</span> <span class="re1">$k</span><br /> <span class="sy0"><!</span>--loginview start--<span class="sy0">></span>disk_partitions<span class="br0">&#91;</span><span class="re1">$l</span><span class="br0">&#93;</span>=<span class="sy0">`</span><span class="kw2">fdisk</span> <span class="re5">-l</span> <span class="re1">$k</span> <span class="sy0">|<</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/grep"</span> <span class="re2">title</span>=<span class="st0">"Grep"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki/Grep"</span><span class="sy0">></span><span class="kw2">grep</span><span class="sy0"></</span>a<span class="sy0">></span> <span class="st0">"^/dev"</span> <span class="sy0">|</span><span class="kw2">grep</span> <span class="re5">-v</span> <span class="st0">"Extended$"</span><span class="sy0">|</span><span class="kw2">cut</span> <span class="re5">-d</span><span class="st0">" "</span> -f1<span class="sy0">`</span><br /> <span class="kw3">echo</span> <span class="co1">${disk_partitions[$l]}</span> <span class="re1">$l</span><span class="sy0"><!</span>--loginview end--<span class="sy0">></span><br /> <span class="br0">&#40;</span><span class="br0">&#40;</span>l++<span class="br0">&#41;</span><span class="br0">&#41;</span><br /> <span class="kw1">done</span><br /> <span class="kw1">done</span><br /> <span class="br0">&#125;</span> &nbsp; &nbsp;<span class="co0"># ---------- &nbsp;end of function find_partitions &nbsp;----------</span><br /> <br /> add_fat <span class="br0">&#40;</span><span class="br0">&#41;</span><br /> <span class="br0">&#123;</span><br /> <span class="kw3">echo</span> <span class="st0">"# Added with script for <span class="es2">$label</span> and <span class="es2">$k</span>"</span> <span class="sy0">>></span> <span class="re1">$file</span><br /> <span class="kw3">echo</span> <span class="st0">"<span class="es2">$uuid</span> /mnt/<span class="es2">$label</span> vfat&nbsp; nosuid,nodev,uhelper=udisks,uid=500,gid=500,shortname=mixed,dmask=0077&nbsp; 0 0"</span> &nbsp;<span class="sy0">>></span> <span class="re1">$file</span><br /> <span class="br0">&#125;</span> &nbsp; &nbsp;<span class="co0"># ---------- &nbsp;end of function add_fat &nbsp;----------</span><br /> <br /> add_<span class="sy0"><</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/ext3"</span> <span class="re2">title</span>=<span class="st0">"Ext3"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki/Ext3"</span><span class="sy0">></span>ext3<span class="sy0"></</span>a<span class="sy0">></span> <span class="br0">&#40;</span><span class="br0">&#41;</span><br /> <span class="br0">&#123;</span><br /> <span class="kw3">echo</span> <span class="st0">"# Added with script for <span class="es2">$label</span> and <span class="es2">$k</span>"</span> <span class="sy0">>></span> <span class="re1">$file</span><br /> <span class="kw3">echo</span> <span class="st0">"<span class="es2">$uuid</span> /mnt/<span class="es2">$label</span> ext3     defaults     0 0"</span> <span class="sy0">>></span> <span class="re1">$file</span><br /> <br /> <span class="br0">&#125;</span> &nbsp; &nbsp;<span class="co0"># ---------- &nbsp;end of function add_ext3 &nbsp;----------</span><br /> <br /> find_UUID <span class="br0">&#40;</span><span class="br0">&#41;</span><br /> <span class="br0">&#123;</span><br /> <span class="kw3">echo</span> <span class="st0">"In find_UUID with <span class="es2">$l</span>"</span><br /> <span class="br0">&#40;</span><span class="br0">&#40;</span>l--<span class="br0">&#41;</span><span class="br0">&#41;</span><br /> <span class="kw1">for</span> i <span class="kw1">in</span> $<span class="br0">&#40;</span><span class="kw2">seq</span> <span class="nu0"></span> <span class="re1">$l</span><span class="br0">&#41;</span><br /> <span class="kw1">do</span><br /> <span class="kw3">echo</span> <span class="co1">${disk_partitions[$i]}</span><br /> <span class="kw1">for</span> k <span class="kw1">in</span> <span class="co1">${disk_partitions[$i]}</span><br /> <span class="kw1">do</span><br /> <span class="kw3">echo</span> <span class="re1">$k</span><br /> <span class="sy0"><!</span>--loginview start--<span class="sy0">></span><span class="re2">temp</span>=$<span class="br0">&#40;</span>blkid <span class="re1">$k</span><span class="br0">&#41;</span><br /> <span class="re2">label</span>=$<span class="br0">&#40;</span><span class="kw3">echo</span> <span class="re1">$temp</span><span class="sy0">|</span><span class="kw2">grep</span> <span class="st0">"LABEL="</span><span class="sy0">|</span><span class="kw2">sed</span> <span class="co3">\'</span>s<span class="sy0">/</span>.<span class="sy0">*</span><span class="re2">LABEL</span>=<span class="st0">"//\'|sed \'s/"</span>.<span class="sy0">*//</span><span class="co3">\'</span><span class="br0">&#41;</span><br /> <span class="re2">uuid</span>=$<span class="br0">&#40;</span><span class="kw3">echo</span> <span class="re1">$temp</span><span class="sy0">|</span><span class="kw2">grep</span> <span class="st0">"UUID="</span><span class="sy0">|</span><span class="kw2">sed</span> <span class="co3">\'</span>s<span class="sy0">/</span>.<span class="sy0">*</span><span class="re2">UUID</span>=<span class="st0">"//\'|sed \'s/"</span>.<span class="sy0">*//</span><span class="co3">\'</span><span class="br0">&#41;</span><br /> <span class="re2">atype</span>=$<span class="br0">&#40;</span><span class="kw3">echo</span> <span class="re1">$temp</span><span class="sy0">|</span><span class="kw2">grep</span> <span class="st0">"TYPE="</span><span class="sy0">|</span><span class="kw2">sed</span> <span class="co3">\'</span>s<span class="sy0">/</span>.<span class="sy0">*</span><span class="re2">TYPE</span>=<span class="st0">"//\'|sed \'s/"</span>.<span class="sy0">*//</span><span class="co3">\'</span><span class="br0">&#41;</span><span class="sy0"><!</span>--loginview end--<span class="sy0">></span><br /> <span class="kw1">if</span> <span class="br0">&#91;</span> <span class="re1">$atype</span> = <span class="st0">"vfat"</span> <span class="br0">&#93;</span><br /> <span class="kw1">then</span><br /> add_fat <span class="re1">$label</span> <span class="re1">$uuid</span> <span class="re1">$k</span><br /> <span class="kw1">fi</span><br /> <span class="kw1">if</span> <span class="br0">&#91;</span> <span class="re1">$atype</span> = <span class="st0">"ext3"</span> <span class="br0">&#93;</span><br /> <span class="kw1">then</span><br /> add_ext3 <span class="re1">$label</span> <span class="re1">$uuid</span> <span class="re1">$k</span><br /> <span class="kw1">fi</span><br /> <span class="kw3">echo</span> <span class="re1">$label</span> <span class="re1">$uuid</span> <span class="re1">$atype</span><br /> <span class="kw1">done</span><br /> <span class="kw1">done</span><br /> <span class="br0">&#125;</span> &nbsp; &nbsp;<span class="co0"># ---------- &nbsp;end of function find_UUID &nbsp;----------</span><br /> <br /> find_disks<br /> find_partitions<br /> find_UUID
    </div>
  </td>
</tr>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
Related articles by Zemanta
\"Enhanced
Automation Bash Fstab Mount Script System
© 2018 - 2025 by Amit Agarwal - rss
Bilberry Hugo Theme