Setting up disk space utilization alerts in Google Stackdriver is almost unbelievably tricky. It’s easy to think that you can just choose the metric “Disk Utilization” and add a condition to alert when disk utilization crosses some threshold for some length of time (such as over 55% for 1 hour). File System Type Filter Your […]
Disk space utilization monitoring in Google StackDriver Read More »
I love using Salt to configure and manage servers at scale. Typically, a Salt master server manages an army of servers which are on the same private network. A salt-minion daemon runs on each client server and communicates with the master. Sometimes you need to manage a server which is outside of your internal network,
Managing remote servers with salt-ssh Read More »
Question: What are the timestamps for the last login for every WordPress user in this WordPress site? Most answers say to install some plugin, and there are dozens that will show the date and time when each WordPress user last logged in. However, plugins are a problem, because they always need to be kept up
Find Last Login Time for WordPress Users in the SQL Database Read More »
Scenario A single Percona MySQL 5.7 server replicates asynchronously with a cluster of Percona MySQL 5.7 servers. After rebooting the single server, replication failed with the following symptoms: mysql> show slave status \G**************************** 1. row ************** Slave_IO_State: Waiting to reconnect after a failed registration on master Master_Host: my-replication-partner Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File:
MySQL replication fails with WSREP error after restart Read More »
WordPress 5 didn’t install automatically on sites hosted on my CentOS 7 WordPress hosting server. That’s by design, because I’m selfish and I’d rather wait for a few bug-fix releases before making a major upgrade. When I chose to upgrade manually on a test site, WordPress asked for my FTP credentials: If you’re hosting WordPress
Updating to WordPress 5 on a Linux Host: Requesting FTP Credentials Read More »
I use Wordfence as a WordPress security solution. Even the free version has a comprehensive set of features, and the premium version is even better. It’s very easy to install and configure Wordfence as a regular plugin. However, the step to “Optimize the Wordfence firewall” fails for many people. This is not the fault of
Optimize the Wordfence Firewall: Needs FTP Credentials Read More »
I’m very happy that Harebrained Schemes chose to release its Shadowrun game series (Shadowrun Returns, Shadowrun: Dragonfall, and Shadowrun: Hong Kong) for Linux. It can be a little difficult to get this stuff running on Linux. In this post, I will explain the errors you may see when trying to run Shadowrun on Linux. Installation
How to run Shadowrun: Dragonfall on Ubuntu Linux Read More »
I found the solution for getting the New Relic APM Agent to run on a CentOS 7 system with SELinux Enforcing. The only SELinux modification you have to make is to change the context of the log file directory /var/log/newrelic. You can temporarily make these changes with the chcon command: Kill any running instances of
New Relic APM on Fedora/CentOS/RedHat with SELinux Enforcing: Solved Read More »
How to launch a Unity game downloaded via Steam on Linux.
Running Unity games via Steam in Linux Read More »
Kickstart is a type of file that’s used to automatically install RedHat or CentOS Linux on a physical or virtual server. If you are managing more than a few servers, it’s a good idea to configure the servers via kickstart files instead of logging in and configuring each one manually. However, some unfortunate choices were
Configure CentOS/RedHat VMs with Kickstart files on Virtualbox Read More »