Troubleshooting

• System
  • System Usage Summary
  • Process Investigation
  • Top 5 CPU Processes
  • Ram Usage Breakdown
  • Memory Hoggers
  • TCPDUMP
• Web server
  • Apache Buddy
  • Apache Max Clients
  • php-fpm Investigating
    • php-fpm pal
    • fpm strace
  • Netstat
  • Connections to port
  • 'Site-down' Investigation
    • Log Summary
  • nginx server blocks (httpd -S equivalent)
  • HTTP Headers
• mysql
  • mysql tuner
  • Process Investigation
  • mysql Engines
  • mysql slow logs
  • mysql Replication Investigation
  • mysql database size
• * Networking
  • NAT to Public
  • Transmit/Receive Issues
  • vnstat
• Other
  • Recap/rs-sysmon one-liner
  • How may cores?
  • List all crons
  • Largest files
  • Real Users
  • Brute-force?
  • uptime

* Bash
* Zed Editor
*Editor Environment Settings

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• CentOS vs RHEL
• PHP Versions and Support

• Apache
  
  • Installation
  • vhost
  • prefork
  • SSL
    • Convert .pfx to .pem
    • SSL Expiry
    • SSL Encryption Type
    • Poodle Fix
    • SSL Cipher/Protocol Check
  • SNI
  • Configuration
  • Modules
    • Slow-loris Attack/Mod_reqtimeout
  • x-Forwarded-For
  • HTTP Authentication
  • .htaccess
  • Security

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• Mysql
  • Install
  • my.cnf
  • Tuning
  • Users:
    • Creating/Dropping Users
    • Updating Users Password
    • Resetting lost root password
    • Granting Permissions
    • Changing Host
  • Databases
    • DB Management
  • Tables
    • Creating/Dropping
  • Show Process List
  • Slow Query Log
  • mysqldump
  • Holland Backup
  • phpMyadmin
  • Remote db Access
  • database/tables sizes
  • mysql replication (master slave)

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• Networking
  • Adding Static Routes

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• Logging
  • Recap
  • Sar
  • Logrotate
  • lsof

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• PHP
  
  • php-fpm
  • Versions
  • info.php
  • php.ini
  • Securing PHP
  • Error Logging
  • php upgrade (yum-plugin-replace)

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• iptables
  • Add Port
  • Deleting a rule
  • UFW

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• Nginx
  
  • install
  • server block
  • Http Authentication
  • compression
  • Proxy Pass
  • rewrite/redirect code
  • SSL
  • Security

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• Syncing/Replication/lsync
  • lsync

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• DNS
  • DNS Doctoring

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• Admin
  • Kernel
  • Tune2fs
  • Secure Copy (SCP)
  • find command
  • tar
  • awk + sed
  • rsync
  • Screen Sessions
    • Screen Share
  • rename
  • Sort
  • History TimeStamps
  • zip

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• FTP/sFTP
  • vsFTPd
  • sFTP

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• Mail
  • Sending Mail
  • Deleting Mail

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• Cron Jobs
  • Format + Examples

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• Varnish
  
  • install
  • configure
  • default.vcl
  • restart/test config
  • apache
  • nginx

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• Fail2Ban
  • Install
  • Commands
  • SSH Configuration
  • xmlrpc
  • wp-login

——————————-

• Memcached
  
  • install
  • troubleshooting
  • configure

——————————-

• Redis
  
  • Clearing Cache

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• Hardware
  
  • RAID

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• Plesk
  • Admin password
  • mysql log in
  • General Plesk Stuff
  • Plesk Logs
  • List Plesk Mail Users
  • Plesk FTP Details

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• git
  • Installing
  • Cloning
  • Setting up a git

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• Package Management
  • Yum
  • RPM
  • Repositories
  • yum replace

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• SSH
  • Creating ssh Keys
    • And logging in with ssh key
  • ssh no-keys
  • ssh fingerprint

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• Python
  • altinstall

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• Wordpress
  • Wordpress
• WP Web Design/config Stuff
  • Frontpage Display
  • Wordpress White Screen
  • wp-custom menu

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• Magento
  • Magento Edition/Version
  • Indexing

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• LXC-Containers
  • Overview/Installation

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• Docker
  • Install
  • Basics
  • Creating Containers from images
  • Networking
  • Imaging & Pushing
  • Run Examples

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RedHat7 134

• Systemctl
• Firewalld
  • General
  • Opening ports / services
• SELinux
  • selinux
• Scheduling Tasks
  
• ACLs
  
  • Acls
  • Backup/Restore
• LDAP
  
• Adding Disks, Partitions and Filesystems
  
• Logical Volume Management (LVM)
  
• Accessing NFS
  
• Accessing SAMBA (SMB)