Performance monitoring with Sysdig

The Sysdig software seems highly geared towards containers like Docker but it works just as well on bare metal. The software is scriptable much like dtrace is. In order to work with this utility we must first install it. Download the following playbook, set the correct IP address in the…

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New multi-rotor

My new jankily built quad copter. I plan on tidying up the wiring eventually now that I have all the parts I like but since Lorraine and I are moving to Huston, Texas next week that will have to wait. Specs: FC: Naze 32 afro RX: Spektrum AR6200 VTX: ImmersionRC…

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Memcached and WordPress

Increase your caching game with memcached on WordPress. We’ll be using the LEMP stack setup in https://blog.donthurt.us/2017/02/13/new-vps-setup/. Install the memcached service and PHP extension: yum install -y memcached php70u-pecl-memcached Enable and start the memcached service: systemctl enable memcached systemctl start memcached Reload the PHP-FPM and Nginx services: systemctl restart php-fpm…

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New VPS setup

Before a few hours ago this site was hosted on an OpenVZ container running a cPanel LAMP stack which was provided by the company I work for.  I found a $10 credit for DigitalOcean so I decided I would configure a LEMP stack and move this site over there since…

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CloudLinux mod_lsapi benchmarks

CentOS release 7.3 KVM guest: 1 CPU core (E5-2620) 4GB RAM (DDR4 2133MHz). Apache Config: StartServers 1 MinSpareServers 2 MaxSpareServers 4 ServerLimit 100 MaxRequestWorkers 80 MaxConnectionsPerChild 5000 KeepAlive On KeepAliveTimeout 2 MaxKeepAliveRequests 20 Timeout 100 PHP-FPM 5.6 Zend OpCache / Apache 2.4.23 / Nginx 1.11.6 root@openstack.donthurt.us:~ # siege –concurrent=80 –reps=100 http://blog.donthurt.us…

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Softaculous and CageFS

Sometimes when installing CloudLinux after Softaculous is installed Softaculous is unable to detect PHP versions outside of the server’s native PHP installation. The following steps need to be taken to configure the pre_install hooks for Softaculous to recognize multi-PHP from the command line: cp /usr/local/cpanel/whostmgr/docroot/cgi/softaculous/enduser/hooks/pre_install_cagefs{.txt,.php} cp /usr/local/cpanel/whostmgr/docroot/cgi/softaculous/enduser/hooks/pre_upgrade_cagefs{.txt,.php} cp /usr/local/cpanel/whostmgr/docroot/cgi/softaculous/enduser/hooks/pre_clone_cagefs{.txt,.php} After…

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Changing PHP handlers outside of WHM

cPanel makes it easy to change the handler Apache uses to interpret and execute PHP code. Changing the PHP handler is much quicker if done through the command line. EasyApache 3 With EA3 the PHP handler can be changed with /usr/local/cpanel/bin/rebuild_phpconf using the following syntax: DEFAULT_PHPVER PHP4_HANDLER PHP5_HANDLER SUEXEC_MODRUID2 For…

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Administering ZFS

What is ZFS? ZFS is an advanced, enterprise grade COW (Copy on Write) filesystem and volume manager. It has many features which make it easier to adminster than traditional UNIX filesystems+volume managers. Key Features Online filesystem/volume resizing. Realtime data deduplication and compression. Filesystem snapshots. Checksum all the things. Volume management…

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