When you get this error message from e.g. loginctl show-user [...] after you deleted a user from your system:
What is netfilter's Connection Tracking system? The connection tracking system often referenced as nf_conntrack is part of the...
If you end up with an Elasticsearch cluster which has a very different disk usage on it's nodes you...
When you synchronize directories with rsync you have to pay attention to use (or not use) trailing /. Hint
We have observed Lenovo laptops with nvidia graphics losing performance after they have been in use for a few minutes...
Systemd's networkd will drop IP-Addresses configured by other processes like Keepalived's VRRP, when it is restarted. This...
Important If your railscomplete-deployment uses the net-ssh-gem please ensure you use version 5.2.0 or newer to ensure...
If you're about to handle X509 certificates and don't want to remember/google a handful of openssl commands you...
Before you continue, ensure that you've created your certificate in the region us-east-1 (N. Virginia). Otherwise...
aws ec2 describe-instances --output text --query 'Reservations[].Instances[?!not_null(Tags[?Key == `aws:autoscaling:groupName`].Value)] | [].[InstanceId]' | xargs -L1...
When restoring a barman PITR backup you may encounter this error: Copying required WAL segments. EXCEPTION: {'ret': 2, 'err': '/bin/sh...
There is an issue with when restoring a PostgreSQL dump created with pg_dump < v11 with pg_restore > v10:
collectd5 in version 5.9.0 is broken and you upgraded it everywhere. But because it's FreeBSD it does not...
This is not encouraged because this change is easily forgotten. We recommend using this only if you know what you...
This should not be necessary in any case and is only for special cases, for e.g. if the assets...
With passenger-status --show=requests you can get a huge JSON showing current information about the running passenger processes.
This card is just about creating simple PostgreSQL dumps. This is no instruction for a backup strategy nor a guide...
on the bash (issued as postgres user) Start/Stop/Restart PostgreSQL pg_ctl -D $configdir start|stop|restart Start/Stop/Restart the corresponding PostgreSQL...
Hint You're not able to control which redis replica will chosen for the failover. Connect to your sentinel instance...
Because systemd is the greatest thing ever it's not enough to stop the libvirt service. You need to disable...
You will need to look here and find your own device. Look for the "bootable CD" download, which will give...
If you want to perform a failover on another haproxy backend server this is the way you should do it...
If you try to restart you may encouter the problem that your networking connection gets shutdown but not start again...
Brendan Gregg is the Linux performance god. Use the information in this link to find out what ways there are...