Server Fault Stack Exchange
Server Fault Stack Exchange

Most Popular

more tags
1500 questions
68
votes
9 answers

How can I check from the command line if a reboot is required on RHEL or CentOS?

I'm using CentOS and Red Hat Enterprise Linux on a few machines without the GUI. How can I check if recently installed updates require a reboot? In Ubuntu, I'm used to checking if /var/run/reboot-required is present.
Jim Hunziker
  • 1,852
  • 4
  • 17
  • 18
68
votes
2 answers

GNU less: How can I search while ignoring case sensitivity without using less -I option?

From GNU less manpage -i or --ignore-case Causes searches to ignore case; that is, uppercase and lowercase are considered identical. This option is ignored if any uppercase letters appear in the search pattern; in other words, if a pattern contains…
Tom Feiner
  • 17,578
  • 8
  • 30
  • 24
67
votes
9 answers

What a beginner should know/learn for sysadmin job?

This is a Canonical Question about System Administration Careers When I start my job as System Administrator, what basics skills should I know/learn? Are there any key differences for Network, Storage, Database, and other Administrators?
Dhanapal
  • 905
  • 2
  • 7
  • 9
67
votes
3 answers

How to use docker secrets without a swarm cluster?

Currently we im a running application on a single docker container, the application needs all sorts of sensitive data to be passed as environments variables, Im putting those on the run command so they don't end up in the image and then on a…
Juan Sebastian
  • 1,233
  • 3
  • 10
  • 13
67
votes
3 answers

Rsync triggered Linux OOM killer on a single 50 GB file

I have a single 50 GB file on server_A, and I'm copying it to server_B. I run server_A$ rsync --partial --progress --inplace --append-verify 50GB_file root@server_B:50GB_file Server_B has 32 GB of RAM with 2 GB swap. It is mostly idle and should…
dataless
  • 833
  • 7
  • 11
67
votes
7 answers

Redis (error) NOAUTH Authentication required

I get the error: (error) NOAUTH Authentication required. When in redis-cli and trying to display the KEYS *. I've only set a requirepass not an auth afaiac. I'm in the redis.conf but do not know what to do.
Karl Morrison
  • 1,621
  • 4
  • 29
  • 43
67
votes
4 answers

What is the difference between syslog, rsyslog and syslog-ng?

I am a bit confused in syslog, rsyslog and syslog-ng. From where can I get the source code for syslog()? Is there any difference between rsyslog and rsyslogd?
StackUser
  • 803
  • 1
  • 7
  • 7
67
votes
3 answers

Is a VM with 2 CPUs really faster than one with 4 CPUs?

Our IT created a VM with 2 CPUs allocated rather than the 4 I requested. Their reason is that the VM performs better with 2 CPUs rather than 4 (according to them). The rationale is that the VM hypervisor (VMWare in this case) waits for all the…
AngryHacker
  • 2,877
  • 6
  • 32
  • 33
67
votes
2 answers

Nginx location regex doesn't work with proxy pass

I'm trying to get these 2 location directives working in Nginx but I'm getting some errors back when booting Nginx. location ~ ^/smx/(test|production) { proxy_pass http://localhost:8181/cxf; } location ~ ^/es/(test|production)…
Niels
  • 821
  • 3
  • 9
  • 8
67
votes
5 answers

Why can't I cd to a directory with docker run?

I need to run an application from a specific directory. $ sudo docker run -P ubuntu/decomposer 'cd /local/deploy/decomposer; ./decomposer-4-15-2014' 2014/10/09 21:30:03 exec: "cd /local/deploy/decomposer; ./decomposer-4-15-2014": stat cd…
schmmd
  • 773
  • 1
  • 5
  • 5
67
votes
4 answers

How to remove missing systemd units?

I'm having trouble figuring out how to remove systemd units that no longer have files. They still seem to linger in the system somehow. The old broken units I am trying to remove: core@ip-172-16-32-83 ~ $ systemctl list-units --all firehose-router* …
Andy Shinn
  • 4,211
  • 8
  • 40
  • 55
67
votes
10 answers

Unique Features of bash compared to zsh

I have been a zsh user for quite some time (before that tcsh and before that csh). I am quite happy with it, but was wondering if there are any compelling features of bash that do not exist in zsh. And conversely, are there zsh features which do not…
Tim
  • 1,879
  • 3
  • 18
  • 16
67
votes
4 answers

Drawbacks of mounting a filesystem with noatime?

Having every file be updated just when accessing them sounds like a waste. What's the catch with mounting a file system with the noatime option. What kind of applications/servers relies on the access time?
nos
  • 2,418
  • 3
  • 21
  • 24
67
votes
9 answers

gpg --gen-key hangs at gaining enough entropy on centos 6

Trying to generate a key for a server. gpg --gen-key We need to generate a lot of random bytes. It is a good idea to perform some other action (type on the keyboard, move the mouse, utilize the disks) during the prime generation; this gives…
stormdrain
  • 1,439
  • 7
  • 28
  • 52
67
votes
7 answers

Prevent Windows Server 2012 from forcing a reboot after updates

I have a domain controller with Windows Server 2012 on it. After updates, the server does not reboot immediately. However if I remote into the server I will be presented with a countdown for a reboot. The only options are to restart now or to close…
Bryansix
  • 815
  • 1
  • 7
  • 7
1 2 3
…
99 100