The Book of Knowledge

Example.md

Markdown Examples - core syntax and extensions.

A markdown example shows how to write a markdown file. This document integrates core syntax and extensions (GMF).

• The Book of Knowledge
  • Example.md
  • Markdown Examples - core syntax and extensions.
    • Block Elements
      • Paragraphs and Line Breaks
        • Paragraphs
        • Line Breaks
      • Headers
        • Setext
• This is an H1
  • This is an H2 - atx
  • This is an H1
    • This is an H2
• This is an H1 # ### This is an H2 ## #### This is an H3 ###### *** - Blockquotes - Lists - Unordered - Ordered - Indented - Blockquote - Code Block - Nested List - Code Blocks - Fenced Code Blocks - Syntax Highlighting - Horizontal Rules - Table
  • Span Elements
    • Links
      • Inline
      • Reference
    • Emphasis
    • Code
    • Images
      • Inline
      • Reference
    • Strikethrough
  • Miscellaneous
    • Automatic Links
    • Backslash Escapes
  • Inline HTML

Block Elements

Paragraphs and Line Breaks

Paragraphs

HTML Tag: <p> One or more blank lines. (A blank line is a line containing nothing but spaces or tabs is considered blank.) Code: This will be inline. This is second paragraph. Preview:

The Book of Knowledge

• FC_Troubleshooting.md
• Fibre Channel Troubleshooting
  • Check the existence and status of the fibre cards: lspci | grep -i qlogic
    • Three Ways to Check the status of the fibre cards
    • Check the existence of the LUN devices
    • Check if the number of LUNs is the same in all fibre card links
    • To identify and to locate the WWPN numbers of the installed fibre cards
    • Check if the SCLI (SANsurfer FC HBA CLI) package is installed in the o/s
    • Check the status of the fibre cards
    • Check the modprobe configuration for qla2xxx module

FC_Troubleshooting.md

Fibre Channel Troubleshooting

Check the existence and status of the fibre cards: lspci | grep -i qlogic

Three Ways to Check the status of the fibre cards

systool -c scsi_host -v |egrep -i 'fw_state|link'
/opt/hp/hp_fibreutils/adapter_info
egrep -i "link|run" /sys/class/scsi_host/host?/state

Check the existence of the LUN devices

/usr/sbin/inq -btl -no_dots

Check if the number of LUNs is the same in all fibre card links

lsscsi -g #    (Optional by installing the lsscsi rpm package)

To identify and to locate the WWPN numbers of the installed fibre cards

for n in `ls -lrt /sys/class/fc_host/host[0-9]*/port_name|awk '{print $9}'|cut -d/ -f5`;
  do
    p=`cat /sys/class/fc_host/$n/port_name`; printf "$n - $p\n";
  done

Check if the SCLI (SANsurfer FC HBA CLI) package is installed in the o/s

yum list scli*

Check the status of the fibre cards

systool -c scsi_host -v |egrep -i 'fw_state|link'

Check the modprobe configuration for qla2xxx module

/etc/modprobe.conf or /etc/modprobe.d/qla2xxx.conf

should contain this line

The Book of Knowledge

• GitCommitMessage.md
• How to Write A Git Commit Message
  • The seven rules of a great Git commit message
  • Example
  • How to Install

GitCommitMessage.md

How to Write A Git Commit Message

source

The seven rules of a great Git commit message

Keep in mind: This has all been said before.

1. Separate subject from body with a blank line
2. Limit the subject line to 50 characters
3. Capitalize the subject line
4. Do not end the subject line with a period
5. Use the imperative mood in the subject line
6. Wrap the body at 72 characters
7. Use the body to explain what and why vs. how

Example

Summarize changes in around 50 characters or less More detailed explanatory text, if necessary. Wrap it to about 72 characters or so. In some contexts, the first line is treated as the subject of the commit and the rest of the text as the body. The blank line separating the summary from the body is critical (unless you omit the body entirely); various tools like log, shortlog and rebase can get confused if you run the two together. Explain the problem that this commit is solving. Focus on why you are making this change as opposed to how (the code explains that). Are there side effects or other unintuitive consequences of this change? Here’s the place to explain them. Further paragraphs come after blank lines.

The Book of Knowledge

GitCreateRepo.md

How to Create a Repo from a Directory

• Create Repository in github.com
• Go into the directory containing the project.

git init
git add . #    to add all of the relevant files.
git commit
git remote add origin git@git.dhl.com:pjoslin/<repo-name>
git config --global push.default simple
git push --set-upstream origin master
git push

Proxy and Certificates

If you’re using a proxy and get an SSL warning, try:

The Book of Knowledge

• The Book of Knowledge
  • Glow.md
  • Installing Glow and frogmouth
    • Glow: TUI Markdown Reader and Directory Navigator
    • Frogmouth: Textualize-Based Markdown Reader and Directory Navigator

Glow.md

Installing Glow and frogmouth

• glow (charmbracelet/glow)
• frogmouth (Textualize/frogmouth)

Glow: TUI Markdown Reader and Directory Navigator

Glow can be downloaded from the Releases page, or built if Go 1.13+ is installed:

$ git clone https://github.com/charmbracelet/glow.git
$ cd glow
$ go build

Frogmouth: Textualize-Based Markdown Reader and Directory Navigator

Frogmouth is available through pypi.org or pip.

The Book of Knowledge

JSON.md

Working with JSON

Converting json to yaml

# jq -f toYaml < Data.json or # cmd | jq -f toYaml > Data.yaml Where toYaml is:

# From: https://stackoverflow.com/questions/53315791/how-to-convert-a-json-response-into-yaml-in-bash#53330236

# purpose: converts Json to Yaml

# remarks:

# You can use 'yq -y' to convert json to yaml, but ...

# * this function can be used several times within a single jq program

# * this function may be faster than using yq

# * maybe yq is not available in your environment

# #    input: any Json

# output: json converted to yaml

def toYaml:
   def handleMultilineString($level):
      reduce ([match("\n+"; "g")]                       #    find groups of '\n'
              | sort_by(-.offset))[] as $match
             (.; .[0:$match.offset + $match.length] +
                 "\n\("    " * $level)" +               #    add one extra '\n' for every group of '\n's. Add indention for each new line
                 .[$match.offset + $match.length:]);
   def toYamlString($level):
      if type == "string"
      then handleMultilineString($level)
           | sub("'"; "''"; "g")           #    escape single quotes
           | "'\(.)'"                      #    wrap in single quotes
      else .
      end;
   def _toYaml($level):
      (objects | to_entries[] |
          if (.value | type) == "array" then
              "\(.key):", (.value | _toYaml($level))
          elif (.value | type) == "object" then
              "\(.key):", "\("    ")\(.value | _toYaml($level))"
          else
              "\(.key): \(.value | toYamlString($level))"
          end
      )
      // (arrays | select(length > 0)[] | [_toYaml($level)] |
          "  - \(.[0])", "\("    ")\(.[1:][])"
      )
      // .;
   _toYaml(1);

Magic Kindle Search Options

How To Use The Codes

1. Open Up A Search Box By Tapping On The Magnifying Glass
2. Enter “;711” (without The Quotes) As The Search String.
3. Tap The Right Arrow Or Return Key To Search. Extensive Info About The WiFi Link Will Appear.

Other Codes

1. Reading Progress Calculation Displayed In The Lower Left Corner: ;ReadingTimeOff - switches off the reading time display ;ReadingTimeOn - switches on the reading time display ;ReadingTimeReset - resets the reading time computation

The Book of Knowledge

LICENSE.md

The license for Paul’s Book of Knowledge

The Creative Commons License

Book Of Knowledge by Paul R. Joslin is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at GitHub. [//]: # ( vim: set ai et nu sts=2 sw=2 ts=2 tw=78 filetype=markdown :)

HAPROXY Log Format

Chart

Detailed fields description

• “client_ip” is the IP address of the client which initiated the TCP connection to haproxy. If the connection was accepted on a UNIX socket instead, the IP address would be replaced with the word “unix”. Note that when the connection is accepted on a socket configured with “accept-proxy” and the PROXY protocol is correctly used, or with a “accept-netscaler-cip” and the NetScaler Client IP insertion protocol is correctly used, then the logs will reflect the forwarded connection’s information.

The Book of Knowledge

OCPMetrics

Resource Usage and Quotas in OpenShift Container Platform

Pod - Metrics

Get current usage (cpu, memory) for all running pods in the current namespace. Use --all-namespaces and --no-headers as needed.

$ oc get PODMetrics
NAME                                           CPU    MEMORY WINDOW
api-newops-data-76b4c9dfcc-79jqc               0      424772Ki 5m0s
api-ramp-machine-sorting-7f5d79f755-8z644      1m     454840Ki 5m0s
api-ramp-machine-sorting-7f5d79f755-dk6ht      1m     491500Ki 5m0s
api-ramp-machine-sorting-7f5d79f755-mks28      1m     480784Ki 5m0s
...

Pods Not Running

Use -ns NAMESPACE if needed. .status.phase is usually “Running” or “Succeeded”. You can filter one or both out. File: