deleting message from postfix queue

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To list the queue execute:
mailq
You can find the problematic messages id and the execute:

find /var/spool/postfix -name "messegeID" | xargs rm

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How to set or disable auto-logout on bash shell

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Following information is intended for bash shell only.
The system variable TMOUT can be set to specify the amount of time the user is inactive before the user is automatically logged out.
Set the following listed below in the /root/.bashrc file: TMOUT=XXX #
The system will logout the root account after one hour of inactivity. The value entered for the TMOUT= variable is in seconds. To represent 1 hour, we have to multiply as follows: 1 hour is 60 minutes. 60 minutes * 60 seconds = 3600 seconds.
After setting the parameter, the intended user will need to log out and then log in for the changes to take effect. To make modifications apply to all users on the system, specify the TMOUT variable in /etc/ profile.
To disable auto-logout simply comment out or delete the line with TMOUT value

Provided by:Forthscale systems, cloud experts
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How to Install Terraform 0.12 on Ubuntu 18.04

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To this day (8/8/2019) Terraform is not packaged in an official apt repository. There is an option to install it with Snap but be careful it will probably be an older version. When i checked it was v0.11.11
If you do want to install it with snap, run:

$  snap install terraform

To install the latest version follow this procedure.
You might want to update your system just in case:

$ sudo apt-get update

Now since you are getting a Terraform binary from official Hashicorp site, you will need both wget and unzip packages unless already installed:

$ sudo apt-get install wget unzip

Last step would be to download an unzip Terraform package (you can find latest here).

$ wget https://releases.hashicorp.com/terraform/0.12.6/terraform_0.12.6_linux_amd64.zip
$ sudo unzip ./terraform_0.12.6_linux_amd64.zip -d /usr/local/bin/

check that it is installed:

$ terraform -v

you are all done.

Provided by:Forthscale systems, cloud experts
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How to install PGPool II on PostgreSQL Servers in master-slave architecture + PGPoolAdmin web managment

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General InformationPGPool can run on same server along with PostgreSQL DB or on stand alone server(recommended). In this article we will install PGPool on stand alone server, but the only difference is connection ports on PGPool and PostgreSQL. We will install PGPool II 3.1 on PostgreSQL 9.1.


Basic architecture: ┏───────────────┓ │                │ │    pgpool-1    │ │  pgpool server │ │                │ ┗───────────────┛ //             \\ //               \\ //                 \\ \\//                \\// \/                  \/ ┏───────────────┓           ┏───────────────┓ │                │           │                │ │    pgsql-1     │ streaming │     pgsql-2    │ │  pgsql master  │══════════>│  pgsql slave   │ │     server     │replication│     server     │ │                │           │                │ ┗───────────────┛           ┗───────────────┛


Fail cases:Slave failsIn case slave server will fail PGPool will start failover.sh script and will mark server as Down (state 3). I…
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