![]() In this case, the process zabbix_agentd is listening on port 10050. The fifth column shows the socket: Local Address:Port. Where the flag -l means print all listening sockets, -t displays all TCP connections, -u shows all UDP connections, -n means print numeric port numbers (instead of application names) and -p means show the application name. To determine the port a daemon process is listening on, you can use the netstat or ss command as shown. # running_services #use the Tab completionīesides, an important aspect of services is the port they use. And from now onwards, use the “ running_services” command to view a list of all loaded, actively running services on your server. Save the changes in the file and close it. alias running_services='systemctl list-units -type=service -state=running' Then add the following line under the list of aliases as shown in the screenshot. If you frequently use the previous command, you can create an alias command in your ~/.bashrc file as shown, to easily invoke it. # systemctl list-units -type=service -state=running all loaded and actively running services), run the following command. List All Active Running Services in Systemdīut to get a quick glance at all running services (i.e. # systemctl list-units -type=service -state=active # systemctl list-units -type=serviceĪnd to list all loaded but active services, both running and those that have exited, you can add the -state option with a value of active, as follows. To list all loaded services on your system (whether active running, exited, or failed, use the list-units subcommand and -type switch with a value of service. If you want to change the limit on the number of processes for a particular user, you need to add an entry in /etc/security/ you run the systemctl command without any arguments, it will display a list of all loaded systemd units (read the systemd documentation for more information about systemd units) including services, showing their status (whether active or not). Normally, a non-root user has a limit on the number of processes. ![]() The root user doesn’t have a limit on the number of processes, ulimit -a will show all kinds of limitation of resource for a user. If you want to change the maximum number, you could write to /etc/nf: kernel.pid_max = 4194303 Usually, 4194303 is the maximum limit for x86_7 for x86. Or with sysctl command: $ sysctl kernel.pid_max ![]() ![]() On Linux, you could check the maximum number of processes with the command: $ cat /proc/sys/kernel/pid_max You may be curious about the number limit of running processes in a system. Pgrep is a very useful command to lookup running processes based on name, process ID and other attributes of a process. If you want to count the number of spawned process by httpd, these two commands will be your choice: $ ps -C httpd -no-headers | wc -l If you want to count the processes of a specific user, use the following command: $ ps -U user1 -no-headers | wc -l We can use this command piped with wc to get the number of running processes in Linux, remember to remove the header of output, -no-headers added. The shell command ps could be used to list most process statistics. ![]()
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