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Provisioner

$ kubectl get storageclasses
NAME                   PROVISIONER                                         RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path                               Delete          WaitForFirstConsumer   false                  4d18h
nfs                    cluster.local/nfs-nfs-subdir-external-provisioner   Delete          Immediate              true                   97m

PV (not associated with the storage class)

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ACI API calls

ToC

• Authenticate
• Get all tenants
• Create / delete tenant
• Create / delete application profile
• Create / delete EPG
• Create / delete VRF
• Create / delete bridge domain

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Buffers

keys	Action
:ls	list open buffers
:b3	go to third buffer
:bn	buffer next
:bp	buffer previous
:bp	buffer delete (close)
:e .	browse working directory

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Linux essentials

TOC

• Package management
  • RPM based
  • Debian based: APT and dpkg
• Command-line basics
  • Command-line syntax
  • Basic commands

• Command history and completion

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Ansible setup, configure, and ad hoc commands deep dive

Ansible is an automation engine that allows for agentless system config and deployment. Ansible operates over SSH and runs Ansible modules on remote systems to complete tasks.

TOC

• Ansible setup
  • Installing ansible
  • Configuring SSH and sudo for ansible
• Ansible configuration
  • The ansible configuration file

• Setting up the ansible inventory

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BGP neighbor states

• Idle:
  • Trying to initiate a TCP connection and listening for TCP connections from peers
  • Admin disabled (neighbor shutdown)
  • Router is waiting before next retry
• Connect: BGP initiates the TCP 3-way handshake.
  • If successful, send Open msg and change to OpenSent.
  • If failed, reset the ConnectRetryTimer and move to active state.
• Active: Trying to establish TCP connection; no BGP messages yet sent
• OpenSent: TCP connection exists and this router has sent the first message to establish the BGP neighbor relationship

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Linux managing DNS servers (LPIC-2)

Quick command reference

lsb_release -d          # get Linux distro and version
cat /etc/centos-release

# ubuntu
sudo /etc/init.d/bind9 {start | stop | restart}

sudo -u bind rndc status

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Useful show commands

TOC

• Switch interface status
• MAC addresses
• VLAN
• CDP
• STP
• VTP
• DHCP

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Shortcut	Description
Ctrl-B	More cursor one char left, good for multi-line commands
Ctrl-C	Cancels the command and returns to the command prompt (EXEC mode)
Ctrl-D	Deletes the character at the cursor
Ctrl-F	Moves the cursor one character to the right
Ctrl-G	Exits to the previous command mode without removing the command string
Ctrl-K	Deletes all characters from the cursor to the end of the command line
Ctrl-L	Redisplays the current command line
Ctrl-N	Displays the next command in the command history

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Practice sites

• RegEx 101 - Handles PCRE (PHP), JavaScript, and Python
• RegExr - Lets you test replacing using capture groups. Cannot handle lookbehinds b/c JavaScript only
• regex one - Has lessons

RegEx metachars and symbols

Metachar	Meaning
\n	newline