githubfoam

RDMA verification
This work assumes there are two nodes to run iscsi target/initiator environment.
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Load the RDMA drivers using the following command line
/etc/init.d/openibd start

If one is using the InfiniBand transport and he doesn't have a managed switch in the subnet, he has to start the Subnet Manager (SM). Doing this in one of the machines in the subnet is enough, this can be done with the following command line
/etc/init.d/opensmd start
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Verify that traffic is working

githubfoam

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# change Vagrant's default directory where it creates VMs, Windows 11
Set the VAGRANT_HOME environment variable: This is the recommended way to change the default directory, as it is supported by all Vagrant providers. To set the VAGRANT_HOME environment variable, open a terminal and enter the following command

PowerShell
> Set-Item -Path Env:VAGRANT_HOME -Value "D:\tempo"
> Get-ChildItem Env:
VAGRANT_HOME                   D:\tempo
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vagrant up vg-mrtg-03 --debug-timestamp #debug vagrant

githubfoam

Brick –> is basic storage (directory) on a server in the trusted storage pool.
Volume –> is a logical collection of bricks.
Cluster –> is a group of linked computers, working together as a single computer.
Distributed File System –> A filesystem in which the data is spread across the multiple storage nodes and allows the clients to access it over a network.
Client –> is a machine which mounts the volume.
Server –> is a machine where the actual file system is hosted in which the data will be stored.
Replicate –> Making multiple copies of data to achieve high redundancy.
Fuse –> is a loadable kernel module that lets non-privileged users create their own file systems without editing kernel code.
glusterd –> is a daemon that runs on all servers in the trusted storage pool.
RAID –> Redundant Array of Inexpensive Disks (RAID) is a technology that provides increased storage reliability through redundancy

githubfoam

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Vi stands for Visual,Vim stands for Vi IMproved.
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 Type o (lower case) to insert, or open, a blank line below the current line. 
 Type O (upper case) to insert a blank line above the current line
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 copy is called yank (y)
 cut is called delete (d)
 paste is called put (p)
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githubfoam

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 # Use VBoxManage to customize the VM.
 
      openstack.vm.provider :virtualbox do |vb|         
          vb.customize ["modifyvm", :id, "--ioapic", "on"] # turn on I/O APIC
          vb.customize ["modifyvm", :id, "--cpus", "#{$cpus}"] # set number of vcpus
          vb.customize ["modifyvm", :id, "--memory", "#{$memory}"] # set amount of memory allocated vm memory
          vb.customize ["modifyvm", :id, "--ostype", "Ubuntu_64"] # set guest OS type
          vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"] # enables DNS resolution from guest using host's DNS
          vb.customize ["modifyvm", :id, "--nicpromisc3", "allow-all"] # turn on promiscuous mode on nic 3

githubfoam

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# =====LOCAL NOT REMOTE SSH==== ansible_connection=local
# operations center to remote control other hosts
[clients]
remotecontrol01 ansible_host=10.217.50.13 ansible_connection=local

[masters]
k8s-master01 ansible_host=10.217.50.10 ansible_connection=ssh ansible_ssh_private_key_file=/home/vagrant/.ssh/id_rsa ansible_user=vagrant

[workers]

githubfoam

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#disable public key authentication, connect as user root via ssh 
sshuser@vg-ubuntu-01:~$ ssh root@vg-ubuntu-02 -o PubkeyAuthentication=no
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#connect with one private key

#access ec2-23-22-230-24.compute-1.amazonaws.com with a private key located in ~/.ssh/alice.pem
$ ssh -i ~/.ssh/alice.pem alice@ec2-23-22-230-24.compute-1.amazonaws.com
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$ cat ~/.ssh/config

githubfoam

gpg --version
gpg (GnuPG) 2.0.22

eval $(gpg-agent --daemon) -> make sure gpg-agent is running
gpg-agent -> Check if gpg-agent is running

gpg --gen-key -> generate a GPG key pair 
gpg --list-secret-keys --keyid-format LONG -> List public and private key GPG keys.
                                              A private key is required for signing commits or tags.
gpg --delete-secret-keys 3AA5C34371567BD2 -> delete secret keys

githubfoam

============================================================================
$ ansible-galaxy --version
ansible-galaxy 2.4.2.0
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ansible-galaxy install --roles-path . -r requirements.yml
ansible-galaxy --offline init role_name
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ansible-galaxy install -r requirements.yml
ansible-playbook playbook.yml -i inventory 
============================================================================

githubfoam

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# 8. VBoxManage
https://www.virtualbox.org/manual/
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# Networking Modes
https://www.virtualbox.org/manual/ch06.html#network_bridged
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Windows Host
>vboxmanage --version