Systems Administration | The Linux Authority

Replicating an NDC database cluster

By Steven Protter · August 30, 2020 · Clustering & High Availability, galera cluster, mysql, Networking, Systems Administration

Centos 7.7 and QEMU

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Setting up a new qemu network

By Steven Protter · August 13, 2020 · Clustering & High Availability, galera cluster, ispconfig, mysql, Networking, Systems Administration, Virtualization

KVM Virtualization made easy. We needed a network to match what we run production in google compute in. So we used a gui and built it. Click forward

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Upgrading mariadb cluster lab

By Steven Protter · August 9, 2020 · mysql, postfix, Scripting & Automation, Systems Administration

Step 1: Back up your data. Step 2: BACK UP YOUR DATA. Step 3: BACK UP YOUR FRACKING DATA (Never watched the new Battlestar Galactica this is an f-word replacement). You might lose your data. Read the procedure and process and RELEASE notes on Mariadb web site. link as of this publish date: https://mariadb.com/kb/en/upgrading-from-mariadb-104-to-mariadb-105/ There […]

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RHCSA exam taking techniques to assist in validation & debugging

By Steven Protter · October 5, 2018 · LVM, Networking, RHCSA exam prep, selinux, swap, Systems Administration

If possible go graphical. This makes opening multiple terminal windows easier. But there are more than one interface available in non-graphical mode. ctrl-alt-1-9 or function keys will give you as many debugging interfaces as you need. What do you enter in your debugging interface/session? There are other logs that might be helpful but these did […]

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Set default boot mode to graphical rhel7

By Steven Protter · October 2, 2018 · RHCSA exam prep, Systems Administration

As root: systemctl set-default graphical.target who -r to see current boot mode. I’m sitting here in an exam center waiting to take the test while red hat resolves a technical glitch. I had some technical anxiety so I looked this up.

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LDAP Integration: Question 13 or 14

By Steven Protter · September 28, 2018 · Networking, RHCSA exam prep, Systems Administration

As suspected it was my back end classroom server configuration that was the issue. Firewall rules in place: yum -y install autofs systemctl enable autofs systemctl start autofs systemctl status -l autofs showmount -e classroom.example.com

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Mail stuck inbound ispconfig 3 galera cluster

By Steven Protter · September 25, 2018 · amavis, Clustering & High Availability, dovecot, galera cluster, ispconfig, mysql, Networking, postfix, spamassassin, Systems Administration

Nail is stuck in the inbound que complaining about sql/mysql connect issues: Make sure hard coded passwords are the same in ispconfig.inc.php in /usr/local There are two config files with two password entries each they must be all the same. The password entries fo the mysql-*.cf files and there are a lt must be the […]

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