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Fedora
rescue mode
SUnreclaim memory usage very high
disable user accounts
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RHEL/CentOS 7
adding a new ip to an interface
Clam Scan / Virus Scan
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Path of process executable
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Prevent a service from being killed off by the oom-killer process
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Yum Plugin Replace
yum shell
install ioncube loader
remove kernels
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How do I restore permissions of all the rpm packages on system to default?
corrupt rpmdb and recovery
Check if CVE was patched in a previous update
Ubuntu 16
Change DNS Settings
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Ansible
hello_world
disable host_key_checking
playbook
Apache
access log
prefork mpm example
process .html/.htm files as php
Enable Core Dumps
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errors
No space left on device: Couldn’t create accept lock |OR| (28)No space left on device: AH00023: Couldn’t create the ssl-cache mutex
Rackspace Load Balancer
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all tables of type MyISAM
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get size of all databases
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Convert MyISAM to InnoDB
import compressed db when there isn’t enough space to decompress
replication
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move mysql datadir
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with wordpress behind load balancer
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openssh
List running ciphers and kexalgorithms
Patched for CVE?
turn on debug
How to configure the SSH service to use a unique Diffie-Hellman moduli of 2048 bits or greater
Varnish
503 errors
WebApps
Magento
is maintenance mode enabled?
get base_url’s from the database
get version from command line
Magento Cron Jobs Location
where are magento stack traces located at?
search engine being used?
Drupal
version
WordPress
behind ssl terminated load balancer
List all wordpress versions on device
Change and Update WordPress URLS in Database When Site is Moved to a new Host
gitlab
set up hostname
Django
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phpmyadmin
Plesk
php-fpm status page
List all subscriptions
list all plesk domains / ip addresses
make a plesk chrooted user
password
proxy pass
show all mail user passwords
modify php-fpm max_children on Plesk < 17.5
update all domains on a wildcard cert to use new wildcard cert
Tools
foxy proxy
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MTR
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Dell
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pv
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proxy through a bastion
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Security
OpenSSL
firewalld
iptables
ufw
fail2ban
Kerberos
process .html/.htm files as php
.htaccess file:
AddType application/x-httpd-php .html .htm