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Linux Notes

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  • Code
    • c
      • gcc
    • bash
      • math
      • types
      • configuration files
      • examples
    • PHP
    • CSS
      • Which browsers support which properties?
    • Python
      • virtualenv
      • list comprehension examples
      • Strings
      • pip/pip3
      • ctypes
      • selenium
        • examples
        • Explicit Wait
        • Implicit Wait
      • split and strip
    • Git
      • commands
      • something missing?
      • Initial Setup
      • auto-completion
      • Cloning an Existing Repository
      • Clone github repo from specific commit version
      • Log and Status
      • Branches
      • .gitignore
    • vim
  • Systems
    • load balancer headers
    • Fedora
    • rescue mode
    • SUnreclaim memory usage very high
    • disable user accounts
    • setup a chrooted sftp user
    • add an ip
    • RHEL/CentOS 7
      • adding a new ip to an interface
      • Clam Scan / Virus Scan
      • Network Time
      • Adding static routes
      • Path of process executable
      • Restart a service automatically after pid is killed or crashed
      • Prevent a service from being killed off by the oom-killer process
      • Query Available Packages From Selected YUM Repository
      • Yum Plugin Replace
      • yum shell
      • install ioncube loader
      • remove kernels
      • selinux
      • rpm
        • 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
  • Services
    • Ansible
      • hello_world
      • disable host_key_checking
      • playbook
    • Apache
      • access log
      • prefork mpm example
      • process .html/.htm files as php
      • Enable Core Dumps
      • Leverage Browser Caching
      • Enable Gzip Compression
      • KeepAlive
      • Password Protect Access
      • redirect
        • www to non www
        • http to https
      • 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
    • Docker
      • Installation
      • Commands
        • run
        • Removal
        • ports + mounts
      • Dockerfile
    • Dovecot
    • ElasticSearch
    • Let’s Encrypt
      • certbot
    • MYSQL
      • commands
      • tuning
        • slow queries
        • Enable Slow Query Logging
        • timeouts
      • one liner’s
        • size of myisam vs innodb data
        • all tables of type MyISAM
        • all tables of type InnoDB
        • get size of all databases
        • size of largest tables
        • buffer pool
        • Convert MyISAM to InnoDB
        • import compressed db when there isn’t enough space to decompress
      • replication
      • Troubleshooting
        • mysqlbinlog command
        • move mysql datadir
    • newrelic
    • Nginx
      • with wordpress behind load balancer
      • proxy_pass
      • h2 / http2
    • Package Management
      • apt-cache / apt-get
      • dpkg
    • php-fpm
    • Postfix
      • Anti-Spam Tools
      • Commands
      • SMTP TLS
      • Securing SMTP
      • Maildir Mailboxes
      • Configurations
      • Maximum Email Size
      • Virtual Alias Maps
      • Create an alias for a user
    • PostgreSQL
    • Redis
    • Samba
      • Server
      • Client
    • 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
      • migrations
      • pipenv
      • 1.1 vs 2
      • Model
      • Set up and use crispy forms
      • Templates
        • setup
        • Static Files
        • loops
        • extending templates
    • 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
    • auditd
    • iperf
    • nohup
    • MTR
    • DCOPS
      • Dell
      • c states / power profile set max performance
    • find
    • mount
      • bind mount
    • curl
    • awk
    • one liner’s
      • io
      • disk space
    • cut
    • diff
    • pv
    • expect
    • screen
    • ssh
      • restrictive shell
      • proxy through a bastion
    • TCPDUMP
    • strace
    • symlinks
    • tar
    • tr
    • whois
    • wget
  • Security
    • OpenSSL
    • firewalld
    • iptables
    • ufw
    • fail2ban
    • Kerberos

Templates

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