How to Migrate CentOS 8 to AlmaLinux […]
Install Cpanel Control Panel
To install Cpanel control panel, run following command as user root.
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cd /home && curl -o latest -L https://securedownloads.cpanel.net/latest && sh latest |
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Extracting SSL certificate from the Java Keystore (JKS)
To extract SSL certificate and private key from Keystore (JKS) file, run
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keytool -importkeystore \ -srckeystore keystore.jks \ -destkeystore keystore.p12 \ -deststoretype PKCS12 |
It will ask for the new Keystore password and current Keystore password. Once you enter the password, JKS file gets converted to P12 format. This will include all certificates in the keystone. If you only need a specific certificate, then use
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-srcalias NAME_HERE |
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List contents of jks keystore file
To list the content of jks keystore file used by tomcat web server, run command
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keytool -list -keystore FILE.jks |
It will ask Keystore password. Once you enter the password, it will list the contents of the file. In the above keystore, there are 5 certificates with names inter, root1, root2, ssl_tomcat2, and tomcat. To get detailed information on […]
keytool
The keytool command is a key and certificate management utility. It enables users to administer their own public/private key pairs and associated certificates for use in self-authentication (where a user authenticates themselves to other users and services) or data integrity and authentication services, by using digital signatures. The keytool command also enables users to cache […]
How to change pure-ftpd port
pure-ftpd by default listens on port 21. We will change the FTP port from 21 to some other port. This instruction work for RHEL, CentOS, AlmaLinux, Oracle Linux, and RockeyLinux. To change FTP port to some other port, edit file
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vi /etc/pure-ftpd/pure-ftpd.conf |
Find
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# Bind 127.0.0.1,21 |
Add below
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Bind FTP_PORT_HERE |
Example
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[root@backendz ~]# cat /etc/pure-ftpd/pure-ftpd.conf | grep -i bind # Bind 127.0.0.1,21 Bind 2121 [root@backendz ~]# |
This will change FTP port to 2121. […]
How to view the contents of tar.gz file
To view the contents of tar.gz file, run
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tar tf FILE.tar.gz |
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-f, --file=ARCHIVE use archive file or device ARCHIVE -t, --list list the contents of an archive |
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zabbix
How to install zabbix agent on Ubuntu […]
How to install zabbix agent on Ubuntu
To install the Zabbix agent on Ubuntu, run the command
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apt install zabbix-agent |
To autostart, Zabbix agent on boot, enable it with
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systemctl enable zabbix-agent |
To manage Zabbix, use commands
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systemctl stop zabbix-agent systemctl start zabbix-agent systemctl restart zabbix-agent |
To see Zabbix listening port
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netstat -lntp | grep zabbix |
Edit file
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vi /etc/zabbix/zabbix_agentd.conf |
Find
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Server=127.0.0.1 |
Replace with
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Server=127.0.0.1,IP_OF_ZABBIX_SERVER_HERE |
Restart zabbix agent
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systemctl restart zabbix-agent |
After the Zabbix agent is installed, you need to add […]
How to find java version
To find the java version, run the command
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java --version |
Example
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boby@sok-01:~$ java --version openjdk 14.0.2 2020-07-14 OpenJDK Runtime Environment (build 14.0.2+12-Ubuntu-120.04) OpenJDK 64-Bit Server VM (build 14.0.2+12-Ubuntu-120.04, mixed mode, sharing) boby@sok-01:~$ |
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