Site Reliability Engineer HandBook
Introduction
Operating System
Linux Boot Process
Filesystems
RAID
IPC
Sockets
RPC
Signals
POSIX signals
Threads
Streams
Caching
Scheduler
Write-through, write-around, write-back: Cache explained
Tempfiles
System Calls
PID Definition
Shared Memory
Zombie process
What's in an inode?
What are the common run levels in linux
What is the difference between soft and hard links
What happens when a process forks?
How-To Compile Linux Kernel from Source
Understanding Sticky-Bit, SUID and SGID in Linux
Understanding User and Kernel Mode
Understanding Linux CPU Load - when should you be worried?
Kernel namespaces
Control groups
Stack vs Heap
What is the difference between a process and a thread
The Differences Between MBR and GPT
Fork
Exec
How Linux actually handles fork and exec
PROC
Error Detection & Correction
limits.conf
PXE Boot
Anatomy of the initrd and vmlinuz
Buffer and Cache
Unix time
Networking
TCP connection
What is SYN Flood, ICMP Flood
How does DNS server work
Hubs vs Switches vs Routers – Networking Device Fundamentals
TCP\/IP Protocol Fundamentals Explained with a Diagram
OSI MODEL
Journey of a Data Packet in the Internet
Introduction to Linux IP Routing Fundamentals
Virtual Local Area Network (VLAN)
What is the difference between UDP and TCP internet protocols?
SMTP, a simple socket protocol
POP3, the Post Office Protocol
IMAP, the Internet Message Access Protocol
How to subnet: Subnetting calculations and shortcuts
HTTP Status Code
How does HTTPS actually work?
What is SSL and what are Certificates?
CIDR (Classless InterDomain Routing)
Address Resolution Protocol (ARP) definition
Egress traffic
Ingress traffic
NAT - Network Address Translation
UDP Services
HTTP with Non-Persistent Connections
HTTP with Persistent Connections
How SMTP work
How DNS work
When do DNS queries use TCP instead of UDP?
A Day in the Life of a Web Page Request
CDN Operation
Network\/Subnet splitting
TCP Connection Termination
Ethernet Bonding modes
EtherChannel Switch Link Aggregation
Broadcast Address Definition
Tshark
Programming Language
Python
Time Format
Subprocess
Multiprocess
Rename
SMTP
Single instance of program
Argparse
Requests
Pyinstaller
Readlines
Raw Input
With Open
Configparser
Gzip
Listdir
Basename
Dirname
Traversing a Directory Tree
Startswith
Endswith
Virtualenv
Regular Expressions
Supervisor
Socket
Exception Errors
Raw_input
Threading
Unittest
Why is it better to use “#!\/usr\/bin\/env NAME” instead of “#!\/path\/to\/NAME” as my shebang?
OS
Decorator
String Formatting
SimplePrograms
'all', 'any' are Python built-ins
TemporaryFile
How to capture stdout in real-time with Python
Python simple techniques and common reference
python reference fragments
getpass
Method overriding in Python
Multiple levels of 'collection.defaultdict' in Python
String Format
Logging
Convert Unicode Object to Python Dict
The dir( ) Function
Python dictionary has_key() Method
glob – Filename pattern matching
Lambda, filter, reduce and map
doctest – Testing through documentation
Load Python code dynamically
Map, Reduce, Zip, Filter
DICTIONARY COMPREHENSION
Golang
Go file operations
GO EXEC
Go Time Formatting \/ Parsing
Go Control structures - Go for loop, break, continue, range
Golang-Regex-Tutorial
Go Cheat Sheet
Bash
Regex
Validate an ip address
Regular expression metacharacters
.bash_profile vs .bashrc
EXPORT
Scripts
Change default shell
Useful Bash Shell Built-in Commands
Debug
The standard filedescriptors
Exit codes
Special Variables
Small getopts tutorial
How rapid detection of base script syntax errors, it does not execute the script
Write message to a syslog \/ log file
Java
Life cycle of a Thread (Thread States)
Understand JVM GC
JVM Monitoring tool
Enable Garbage Collection Logging
Linux Command Line Tool
Basic
DIFF
AC
AWK
CHMOD
NMAP
NETSTAT
Flock
Traceroute
FIND
GREP
Crontab
Kill
SED
CUT
CURL
IFCONFIG
TCPDUMP
TAR
LSOF
SORT
Xargs
Iptables
xargs vs. exec {}
Hdparm
UNIQ
STAT
Execute Commands in the Background
TAIL
WGET
Date
FDISK
Mount
Make SWAP File
Create a New User
Create a New Group
Setup SSH Passwordless Login in OpenSSH
Parted
RSYNC
YUM
RPM
APT
Install from Source
Log Rotate
FREE
DF
DU
Sysctl
NICE
Renice
PS
DD
BC
LDD
getcap, setcap and file capabilities
Linux_Basename
PMAP
Alternative
Readlink
logrotate
PIDOF
Dmidecode
lshw
printenv
SS
w
Strace
pstree
USERMOD
ltrace
ethtool
IP
Sar
nethogs
zip
FPM
getent
ipmitool
Building RPMs
Megacli
Megacli package version
RKhunter
fping
blkid
FSCK
Package Manager
mktemp
ls
Comm
taskset
fio
tree
ARP
lsblk
Security
Common
DNS VULNERABILITIES
Linux Security 101
The bad guys can attack servers and network infrastructure
The bad guys can sniff packets
The bad guys can masquerade as someone you trust
SSL
THE SYN FLOOD ATTACK
ARP spoofing
Kerberos
HTTPS
Beginners’ Guide To PGP
Virtualization
Docker
Expose Docker Remote API on CentOS
The 15 Commands
The Next 15 Docker Commands
Automation is the Word Using DockerFile!
Docker Registry & Workflows
Ultimate Guide for Docker APIs
Docker Remote API Commands for Images
EXPORT AND IMPORT A DOCKER IMAGE BETWEEN NODES
Time zone Docker vessel problems
Distinction between Docker's Save and Export
Simple Docker
Docker Cheat Sheet
Xen
Xen virtual machines installed on Ubuntu
Xen Common notes
KVM
How-To
CentOS: nf_conntrack: table full, dropping packet
How To Fix “Error: database disk image is malformed” On CentOS \/ Fedora
Finding the PID of the process using a specific port?
How-To create hashed SSH password
How to display and kill zombie processes
Shell command to bulk change file extensions in a directory (Linux)
8 Powerful Awk Built-in Variables – FS, OFS, RS, ORS, NR, NF, FILENAME, FNR
Changing the Time Zone
HOW DO I DISABLE SSH LOGIN FOR THE ROOT USER?
How-To rename the extension for a batch of files?
How-To disable IPv6 on RHEL6 \/ CentOS 6 \/ etc
How to clear the ARP cache on Linux?
How-To crontab running as a specific user
Ansible – exclude host from playbook execution
HOWTO: Use Wireshark over SSH
How-To Change Network Interface Name
How-To Creating a Partition Size Larger Than 2TB
Hot-To Linux Hard Disk Format Command
Hadoop Troubleshooting
Hive Troubleshooting
HowTo Set up hostbased authentication for passphraseless SSH communication.
Difference between a cold and warm reboot
ls -l explained
df falsely showing 100 per cent disk usage
FSCK explained
Manually generate password for \/etc\/shadow
How To Change Timezone on a CentOS 6 and 7
Setting ssh private key forwarding
Persist keys in ssh-agent on OS X
SSH Essentials: Working with SSH Servers, Clients, and Keys
How to Change JVM Heap Setting (-Xms -Xmx) of Tomcat – Configure setenv.sh file – Run catalina.sh
SSH ProxyCommand example: Going through one host to reach another server
How to get Linux's TCP state statistics
Linux TCP retransmission rate calculation
How to determine OOM
How-to check Java process heapsize
Troubleshooting network issues
How to check what sudo acces a user has?
How to copy your key to a remote server?
Linux date and Unix timstamp conversion
SSH client personalized configuration
How to Error Detection and Correction
How To Kerberos
How to identify defective DIMM from EDAC error on Linux
Howto Install and Configure Cobbler on Centos 6
How To Use GPG to Encrypt and Sign Messages on an Ubuntu 12.04 VPS
HowTo: Debug Crashed Linux Application Core Files Like A Pro
Create init script in CentOS 6
Linux Change Disk Label Name on EXT2 \/ EXT3 \/ EXT4 File Systems
How to retrieve and change partition's UUID Universally Unique Identifier on linux
Using Text-Mode Serial Console Redirection
How to Write Linux Init Scripts Based on LSB Init Standard
How to create a Debian package
How to create a RPM Package
How to solve EDAC DIMM CE Error
How to solve fsck.ext4: Unable to resolve UUID\/LABEL
How to expand an existing LSI raid array using MegaCli
How to change user GID and UID in Ubuntu
How to read a segfault kernel log message
How to add cron job via command line
How to restrict process CPU usage using nice, cpulimit, and cgroups
Storage
Object Storage
How an object store differs from file and block storage
Monitoring
Nagios
How can I manually run a nagios check from the command line?
How To Write Nagios Plugin – Bash Script
Zabbix
Graphite
The architecture of clustering Graphite
Database
MySQL
MySQL Best Practices
SQL Views
The \G modifier in the MySQL command line client
20 MySQL (Mysqladmin) Commands for Database Administration in Linux
Postgresql
Postgresql Import Export Table
Practical PostgreSQL
Algorithm
Insertion Sort
Hill Sort
Bubble Sort
Quick Sort
Directly Select Sort
Heap Sort
Merge Sort
Radix Sort
Cache algorithm definition
Software Engineering
The Twelve Factors
Introduction
Background
Who should read this document?
I. Codebase
II. Dependencies
III. Config
IV. Backing Services
V. Build, release, run
VI. Processes
VII. Port binding
VIII. Concurrency
IX. Disposability
X. Dev\/prod parity
XI. Logs
XII. Admin processes
Data Structure
Service
Cloud-Init
Kubernetes
K8S-Network
Kubernetes Recipes
Kubernetes Cheat Sheet
ETCD
RESTful API HTTP methods
Web cache
Mesos
ELK
Cassandra
Hadoop
Hadoop Safe Mode
Common hadoop command
Hadoop How to Kill all the specified user Job
Hadoop view local Sequencefile file
Identify the most CPU-intensive jobs hadooop
Understanding hadoop fsck, fs -dus, -count -q size output
hadoop Management Command --dfsadmin
Running DFSIO mapreduce benchmark test
Quick Apache Hadoop Admin Command Reference Examples
TeraSort benchmark suite
NameNode benchmark (nnbench)
MapReduce benchmark (mrbench)
Hadoop Admin Cert
Rack Awareness
How do I know if my hadoop hdfs filesystem has corrupt blocks, and how do I fix it?
File Locations, Logging, and Common HDFS Commands
Commissioning and Decommissioning Nodes in a Hadoop Cluster
HBase
What are HBase Compactions?
HBase Commands
HBase Shell Commands in Practice
How to fix corrupted files for an HBase table
Hive
Hive notes
Elasticsearch
Kafka
Kafka Cheat Sheet
Kafka useful administration tool
Scylla
Zookeeper
Automation Tool
Ansible
Puppet
Puppet CLI
Puppet DSL
Puppet Master\/Agent Setup
Embedded Ruby (ERB) Template Syntax
Using Templates
Visual Index
Puppet Module Cheat Sheet
Core Types Cheat Sheet
Iterate over datastructures in Puppet manifests
Salt
Salt use notes
Networking Devices
Cisco
Juniper
Version Control
Git
You have an empty repository
Git study notes
Githug – What is it?
Squashing commits in a git feature branch into a single commit in master
SVN
Editor
VIM
Systems Performance
Common Performance Troubleshooting Tool
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How To Change Timezone on a CentOS 6 and 7
How To Change Timezone on a CentOS 6 and 7
ln -s /usr/share/zoneinfo/America/Chicago /etc/localtime date
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