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We accidentally overwrote file /sbin/sysctl with command echo 1 > /sbin/sysctl

How do we restore the file in centos?

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  • 1
    From your backups of course.., or use rpm -qf /sbin/sysctl to determine which rpm package to reinstall?
    – HBruijn
    May 22, 2017 at 19:50
  • Hi, I am absolute newbie. But here is what I have understood from your commend. ( Please confirm if the understanding is correct ) Step 1: executed rpm -qf /sbin/sysctl O/P: procps-ng-3.3.10-10.el7.x86_64 Step 2: I should run below command yum reinstall procps-ng-3.3.10-10.el7.x86_64 Right? Does it have any impact on already running server applications like apache / mysql etc? or any other impact on live production system.
    – Rahul
    May 22, 2017 at 20:53
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    Installing procps is probably safe, but if you're worried wait for a maintenance window.
    – chicks
    May 22, 2017 at 20:54

2 Answers 2

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To expand on HBruijn's comment, here's a sequence of commands that should get that file (and anything else from the same package) back. Note that you need to use yum reinstall as yum install will just tell you that the package is already up-to-date.

[root@centos7-01 msmtp]# rpm -q -f /sbin/sysctl
procps-ng-3.3.10-10.el7.x86_64

[root@centos7-01 msmtp]# yum reinstall procps-ng
...
Installed:
  procps-ng.x86_64 0:3.3.10-10.el7

Complete!
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  • Thanks Paul Its truly a great help. But as I am an absolute newbie would like to understand if these commands would have any impact on live applications such as apache and mysql running on the same machine, Its a production machine :S
    – Rahul
    May 22, 2017 at 20:54
  • Getting below error [root@vij ~]# yum reinstall procps-3.2.8-30.el6.x86_64 Loaded plugins: fastestmirror Setting up Reinstall Process Loading mirror speeds from cached hostfile Could not retrieve mirrorlist http://apt.sw.be/redhat/el6/en/mirrors-rpmforge error was 14: PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'" * base: mirror.fibergrid.in * epel: kartolo.sby.datautama.net.id * extras: mirror.fibergrid.in * updates: mirror.fibergrid.in http://apt.sw.be/redhat/el6/en/x86_64/rpmforge/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'
    – Rahul
    May 22, 2017 at 21:11
  • Ah, now that's a different problem, @Rahul. Fix your DNS resolution. :)
    – Jesse Adelman
    May 22, 2017 at 23:49
1
  • Reinstall the RPM.
  • Copy it from another system.
  • Restore the file from your backups.
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1
  • Getting below error [root@vij ~]# yum reinstall procps-3.2.8-30.el6.x86_64 Loaded plugins: fastestmirror Setting up Reinstall Process Loading mirror speeds from cached hostfile Could not retrieve mirrorlist apt.sw.be/redhat/el6/en/mirrors-rpmforge error was 14: PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'" * base: mirror.fibergrid.in * epel: kartolo.sby.datautama.net.id * extras: mirror.fibergrid.in * updates: mirror.fibergrid.in apt.sw.be/redhat/el6/en/x86_64/rpmforge/repodata/repo‌​md.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'apt.sw.be'
    – Rahul
    May 22, 2017 at 21:28

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