Fixing SSH "no hostkey alg" on Debian/Ubuntu
If SSH to a Debian/Ubuntu server returns no hostkey alg, the SSH client failed the host key algorithm check while connecting. To fix it, check permissions…
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392 notes on Linux, tools and troubleshooting
How to enable TCP port 2375 for external connection on Rancher-Desktop
Racher-Desktop users can have the Docker engine accept TCP connections alongside docker.sock with the following command: docker container run -dt --name expose-docker-on-2375 --
Getting NO_SUCH_PART / "no such message" error while sending or replying on a mail from the Webclient
If you encounter a problem sending mail through zimbra webmail, the error below may appear: method: [unknown] msg: no such message part: 2.2 code: mail.NO_SUCH_PART detail: soap:Sender trace: qtp509886383-3220
How to disable visual mode on mouse select for vim
If selecting text with the mouse in vi enters visual mode, it can cause copy-and-paste problems. To prevent visual mode, create or edit vi ~/.vimrc and add set…
How to add disclaimer per domain on ZIMBRA 8.0
If you use ZIMBRA 8.0, which does not yet support per-domain disclaimer configuration (available from 8.5 onward), you can configure it manually as shown below. Enable domain based signature in glob
How to stress test the memory on linux
stress tests CPU, memory, I/O, and HDD workloads on POSIX systems. This article shares commands to use 95% of memory to check for memory problems.
Ansible Tutorial - Directory layout and Example
Ansible is agentless configuration management using SSH. This tutorial explains directory layout for organizing YAML tasks for easier editing and reuse.
PackStack gets "Failed to load plugin from file prescript_000.py" error
When running packstack to install OpenStack, the following error may appear: [root@openstack-liberty1 ~]# packstack --answer-file=answers.txt ERROR:root:Failed to load plugin from file prescript_000.py
How to fix memory leak from big nfs_inode_cache
A Linux server was reported to be using over 90% of its memory, but its administrator could not identify a memory-heavy process. My initial check with free showed nothing unusual.