Brain's Workbench
Step 1 : Migrate all VMs to another active node
Migrate all VMs to another active node. You can use the live migration feature if you have a shared storage or offline migration if you only have local storage.
Step 2 : Display all active nodes
Display all active nodes in order identify the name of the node you want to remove
Static routing is the process of manually entering the routes to the routing table to reach a particular destination. Basically two commands are used in Linux to add routes. The first command is the old traditional route add and second is the IP route command.
Earlier we learned how to route add in Linux, in this tutorial, here I will show you how to add permanent static routes in Linux distributions such as Centos and Ubuntu.
Adding temporary static routes
In order to add a static route temporarily on your Linux machine, you can use either route or ip command.
You can list the current routing table as follows.
$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.206.1 0.0.0.0 UG 100 0 0 eno1 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eno1 172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0 192.168.206.0 0.0.0.0 255.255.255.0 U 100 0 0 eno1
route -n command
When you want to learn how to revoke Let’s Encrypt SSL/TLS certificates, follow the steps below:
Step 1: Validate Certificate file
Before you revoke a certificate, you’ll want to validate that the correct certificates and key file you’re revoking.. since there is no reversal.. Once a certificate is revoked, it will never be used again…
When you revoke a certificate, the certificate authority publishes that revocation information through the Online Certificate Status Protocol (OCSP), and some browsers will check OCSP to see whether they should trust a certificate…
The Issue
When trying to “Stop” or “Shutdown” virtual machine from Proxmox (PVE) web gui, the “Cluster log” shows
end task UPID:pve:xxxxxxxx:xxxxxxxx:xxxxxxx:qmstop:xxx:root@pam: can’t lock file ‘/var/lock/qemu-server/lock-xxx.conf’ -got timeout end task UPID:pve:xxxxxxxx:xxxxxxxx:xxxxxxx:qmreboot:xxx:root@pam: VM quit/powerdown failed
The Fix
We can manually delete the lock from following path
/run/lock/qemu-server
# The file will be /run/lock/qemu-server/lock-100.conf /run/lock/qemu-server/lock-102.conf ...
Make sure only delete the correct one!
You can also do it using script from this site-
https://dannyda.com/2020/05/11/how-to-fix-proxmox-pve-cant-lock-file-var-lock-qemu-server-lock-xxx-conf-got-timeout-proxmox-cant-shutdown-virtual-machine/
Install Easyengine WordPress on a Debian 10 VM (mine was a KVM).
The following procedure will install EE with following components;
Install EasyEngine on Linux
wget -qO ee rt.cx/ee4 && sudo bash ee ee site create your_domain --type=wp --ssl=le --cache
For detailed installation or customizing your requirement, you may visit- https://easyengine.io/commands/site/create/
Debian stopped packaging mysql-client as of buster. You can use
apt-get install default-mysql-client
Which will install mariadb-client-10.3. MariaDB is a fork of MySQL. The client can still be started with the command mysql.
You need to have PIP installed on your debian system. Check if it’s already installed, if not, install one of the available edition. My setup included
Installing pip for Python 3
Perform the following steps as a user with sudo privileges to install Pip for Python 3 on Debian 10:
Start by updating the package list:
sudo apt update
Install pip for Python 3 and all of its dependencies with the following command:
For administration thoughts, i wonder if there is a command, prosodyctl or other, which can give a list of user registrered on prosody.
Apparently there is a way-
just look into your /var/lib/prosody/[domain]/accounts Folder and type in “ls” then count thr .dat files
Install youtube-dl to download YouTube videos in Linux terminal
youtube-dl is a Python-based small command-line tool that allows downloading videos from YouTube, Dailymotion, Photobucket, Facebook, Yahoo, Metacafe, Depositfiles and few more similar sites. It is written in pygtk and requires Python interpreter to run this program, it’s not platform restricted. It should run on any Unix, Windows or in Mac OS X based systems.
The youtube-dl tool supports resuming interrupted downloads. If youtube-dl is killed (for example by Ctrl-C or due to loss of Internet connectivity) in the middle of the download, you can simply re-run it with the same YouTube video URL. It will automatically resume the unfinished download, as long as a partial download is present in the current directory. Which means you don’t need download managers in Linux just for resuming downloads.
Install httpd
[root@www ~]# yum -y install httpd # remove welcome page [root@www ~]# rm -f /etc/httpd/conf.d/welcome.conf
Configure httpd. Replace server name to your own environment.
[root@www ~]# vi /etc/httpd/conf/httpd.conf # line 86: change to admin's email address ServerAdmin root@srv.world # line 95: change to your server's name ServerName www.srv.world:80 # line 151: change AllowOverride All # line 164: add file name that it can access only with directory's name DirectoryIndex index.html index.cgi index.php # add follows to the end # server's response header ServerTokens Prod # keepalive is ON KeepAlive On
[root@www ~]# systemctl start httpd
[root@www ~]# systemctl enable httpd
Install other required packages.
[root@dlp ~]# yum -y install rsync createrepo