To get started with performance checks and analysis, a interesting utility is available: htop What is htop However trying to dig in processes analysis and looking for files and processes relations may be quite painful. In order to analyse such cases several tools and utilities, like top, nmon, fuser or lsof are available under Linux. > Package yum.noarch 0:3.2.22-26.el5_5.1 set to be updatedĮrror: failure: repodata/2 from epel: No more mirrors to try.I’m pretty sure that most of you already struggled with some low performance systems. Yum update failed in RHEL (Red Hat Enterprise Linux) server 5.5 with EPEL repo ~]# yum update Inspect new firewall settings, notice port changedĪCCEPT tcp - 0.0.0.0/0 0.0.0.0/0 tcp dpt:9876 ctstate NEW

Reload firewalld, which will pick up the new port in ssh.xmlĨ.

Notice that sshd now listens on new portħ. Change /etc/ssh/sshd_config port to 9876Ħ. Edit /etc/firewalld/services/ssh.xml to change port numberĤ.

Make a copy of the default ssh service file:Ĭp /usr/lib/firewalld/services/ssh.xml /etc/firewalld/services/ĪCCEPT tcp - 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 ctstate NEWģ. Think it’s cleaner this way.įor example, here are the steps to change sshd port from the default 22 to 9876:ġ. Instead of messing around with the ports directly with RHEL7/CentOS7 firewall-cmd, I’ve decided to update the port number in the ssh.xml service file instead.

Rhel htop