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RHEL/CentOS

Zimbra OSE CentOS 7 kernel update fails server does not boot

November 14, 2022 by Mika

Reading Time: < 1 minutes Problem: Zimbra OSE trying to update CentOS 7 server kernel gives error(s), and after reboot server does not boot. Clue: …

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How to verify Linux server is secure?

December 20, 2020December 9, 2020 by Mika

Reading Time: 6 minutes How to verify Linux server security? How you can be sure that the system is fully secured? Bad news is …

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How to open MySQL default port for remote connections on RHEL/CentOS (iptables/CFS)

December 8, 2020November 9, 2020 by Mika

Reading Time: < 1 minutes In some situations you might need to open MySQL port for remote connection. That might be the case, for example …

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How to add custom iptables rules with CSF

November 9, 2020November 9, 2020 by Mika

Reading Time: < 1 minutes Configserver Security & Firewall (CSF) is well known iptables based firewall for Linux (Iptables is application used to configure tables, …

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