Transfer files between computers with netcat
You can use netcat (nc) to copy file from one computer/server to another. On destination computer Run netcat in listening
Saving iptables firewall rules
To save iptables firewall rules, run This will print the firewal rule. You can save it to a file. For
xinetd
To run xinetd in forground in debug mode, run
Displaying /proc/PID/cmdline with space
On linux, the file /proc/PID/cmdline shows the command line for the process. If you check content of this file, you
apt-key
apt-key keyserver receive failed: No dirmngr MySQL 8 apt Error The following signatures were invalid
apt-key keyserver receive failed: No dirmngr
When running apt-key command, i get following error. To fix this, run apt install dirmngr
Install MongoDB 4 on Debian 9
You can see detailed instruction on how to install on MongoDB web site. First add key For Debian 8, run
Fix yum duplicate packages
On a CentOS server, when running It failed with following error https://gist.github.com/serverok/c0853120baff8848054cfb598e389c3a This is because previous “yum update” failed for
Making POST request from curl
Here is an example POST request using curl Sending JSON string Post a variable
fsck
To check hard disk, run Auto Repair file system By default fsck will ask you what to do when it
centovacast
Install Paid SSL on Centova Cast Install LetsEncrypt Free SSL on Centova Cast CentovaCast Enable SSL on icecast CentovaCast Enable
Server Monitoring
Monitor Server with Prometheus and Grafana https://my-netdata.io/ sensu Zabbix Monit https://vector.dev/ Auto Restart MySQL if Crashed PHP Script to monitor