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1500 questions
46
votes
15 answers
46
votes
6 answers
Forwarding ports to guests in libvirt / KVM
How can I forward ports on a server running libvirt/KVM to specified ports on VM's, when using NAT?
For example, the host has a public IP of 1.2.3.4. I want to forward port 80 to 10.0.0.1 and port 22 to 10.0.0.2.
I assume I need to add iptables…
steveh7
- 463
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46
votes
3 answers
How can I get CPU count and total RAM from the OS X command line?
How can I get CPU count and total RAM from the OS X command line?
yazz.com
- 7,483
46
votes
3 answers
What is the maximum number of files a file system can contain?
Given the current structure of a directory entry on a ext4 file system on Ubuntu, what is the maximum number of files a file system can contain?
What is the general method of calculating the maximum number of files a file system can contain?
user32678
45
votes
6 answers
Linux - How do I see when a process started?
How can I see when a process started, assuming I know the pid. (On Linux)
Amandasaurus
- 32,281
- 69
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- 263
45
votes
5 answers
bzip2 too slow. Multiple cores are avaible
I am running this command:
pg_dumpall | bzip2 > cluster-$(date --iso).sql.bz2
It takes too long. I look at the processes with top. The bzip2 process takes about 95% and postgres 5% of one core. The wa entry is low. This means the disk is not the…
guettli
- 3,833
45
votes
3 answers
How to set system time dynamically in a Docker container
Is there any way to set a Docker containers system time dynamically (at run time) without effecting the host machine?
Using
hwclock --set --date "Sat Aug 17 08:31:24 PDT 2016"
gives the following error:
hwclock: Cannot access the Hardware Clock…
Vingtoft
- 1,597
45
votes
3 answers
Can different AWS accounts manage different subdomains?
I have two AWS accounts. The master account with example.com as a Hosted Zone, this then has a number of record sets (i.e. api.example.com and kibana.example.com).
A second account will be managing testing.example.com as a Hosted Zone, with the…
mlk
- 561
45
votes
1 answer
For Server-Sent Events (SSE) what Nginx proxy configuration is appropriate?
I've read a bunch of different questions on what Nginx configuration is appropriate for SSE and came up with some confusing results regarding what settings to…
c4urself
- 5,690
45
votes
5 answers
How to shrink /home and add more space on CentOS7
CentOS 7 file system is XFS, And resize2fs doesn't work. I need to shrink /home to 400G and add 100G space to /. What should I do?
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 50G 341M 100%…
GoingMyWay
- 575
45
votes
4 answers
How is Docker Compose version 2 "volumes" syntax supposed to look?
With Docker Compose v1.6.0+, there now is a new/version 2 file syntax for the docker-compose.yml file. The changes include a separate top level key named volumes. This allows to "centralize" volume definitions in one place.
What I am trying to do is…
kaiser
- 1,241
45
votes
4 answers
Ubuntu 15.10 Server; W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
I'm running Ubuntu 15.10 server on a Asrock E3C226D2I board. When I get a kernel update or run update-initramfs -u I get a warning about missing firmware:
root@fileserver:~# update-initramfs -u
update-initramfs: Generating…
wouter
- 553
45
votes
5 answers
Why are many admins using 'Turn off Automatic Root Certificates Update' Policy?
My company distributes a Windows Installer for a Server based product. As per best practices it is signed using a certificate. In line with Microsoft's advice we use a GlobalSign code signing certificate, which Microsoft claims is recognised by…
Jeroen Ritmeijer
- 717
45
votes
12 answers
Equivalent of Linux command `hostname --fqdn` in Windows XP?
Is there a way to find the fully qualified domain name of a Windows XP box?
Being unfamiliar with Windows I would describe what I'm looking for as the equivalent of the command hostname --fqdn available in Linux.
Grundlefleck
- 553
45
votes
2 answers
Slow ssh login - Activation of org.freedesktop.login1 timed out
On one of my servers I've noticed really delay on SSH logins.
Connecting using the ssh -vvv options the delay occurs at debug1: Entering interactive session.
extract of connection:
debug1: Authentication succeeded (publickey).
Authenticated to…
Alasdair
- 571