How to renewal GPG keys

Step1 : list the gpg keys

[root@sankar]# gpg --list-keys
/root/.gnupg/pubring.gpg
------------------------
pub   1024D/1F8EKKRW 2016-04-16
uid                  dev-BACKUP (For dev Servers backup) <sankar@xxxx.com>
sub   2048g/78B5KER5 2016-04-16


Step2: take backup of keys

Pub key:-
[root@sankar]#gpg --output sankar_Profile_Encryption2019.gpg --armor --export 1F8EKKRW


Secret key/Private Key:-
[root@sankar]#gpg --output sankar_Profile_Encryption2019_sec.gpg --armor --export-secret-key 1F8EKKRW


Step3: Edit the key
[sai@sankar]$ gpg --edit-key 1F8EKKRW
gpg (GnuPG) 1.4.5; Copyright (C) 2006 Free Software Foundation, Inc.
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions. See the file COPYING for details.


gpg> expire

Changing expiration time for the primary key.

Please specify how long the key should be valid.

         0 = key does not expire

        = key expires in n days

      w = key expires in n weeks

      m = key expires in n months

      y = key expires in n years

Key is valid for? (0)            ///enter for my case

Is this correct? (y/N) y



gpg>save




Note: if you need to specific years, you need to specify like 2year/3years

how to crack aws certified solution architect associate

I hope this article helps you in your preparation for the AWS CSA - Associate Exam.

I have recently cleared this exam with the second attempt. Having less than a year of experience on the AWS Cloud Platform.

I have tried to share the resources tips purely based on self-learning.

• ·         A complete AWS CSAA course from acloud.guru/udemy by Ryan Kroonenburg.
•       AWS wiki documentation from AWS blog and register the course.
• ·         http://jayendrapatil.com/
• ·         http://jayendrapatil.com/aws-solutions-architect-associate-feb-2018-exam-learning-path/
• ·         A short note for all the concepts:  http://knowledgehills.com/aws/introduction-to-aws.htm
• ·         AWS CSAA concepts FAQs https://aws.amazon.com/faqs/
• ·         Good Practice test papers:  https://www.whizlabs.com/aws-solutions-architect-associate/practice-tests

Please find the below link for detailed overview.

https://www.linkedin.com/pulse/how-crack-aws-certified-solution-architect-associate-ambika-raina/


Thank you.

Enable a TLS with SMTP

backup ordinal config file: 
cp sendmail.mc sendmail.mc_orignal2019 


mkdir -p /etc/mail/certs 

cd /etc/mail/certs 
openssl req -new -x509 -keyout cakey.pem -out cacert.pem -days 365 
openssl req -nodes -new -x509 -keyout sendmail.pem -out sendmail.pem -days 365 

chmod 600 sendmail.pem 

We need to enable below list of parameters. 
vi /etc/mail/sendmail.mc 
define(`confAUTH_MECHANISMS', `LOGIN PLAIN DIGEST-MD5 CRAM-MD5')dnl 
TRUST_AUTH_MECH(`LOGIN PLAIN DIGEST-MD5 CRAM-MD5')dnl 

DAEMON_OPTIONS(`Port=smtp,Addr=10.70.9.12, Name=MTA')dnl 
dnl ### do STARTTLS 
define(`confCACERT_PATH', `/etc/mail/certs')dnl 
define(`confCACERT', `/etc/mail/certs/cacert.pem')dnl 
define(`confSERVER_CERT', `/etc/mail/certs/sendmail.pem')dnl 
define(`confSERVER_KEY', `/etc/mail/certs/sendmail.pem')dnl 
define(`confCLIENT_CERT', `/etc/mail/certs/sendmail.pem')dnl 
define(`confCLIENT_KEY', `/etc/mail/certs/sendmail.pem')dnl 

Compile the config file. 
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf 

start saslauthd service 
service saslauthd start 

restart sendmail service 
service sendmail restart 

How to run SCP in background on Linux.

How to run SCP in background on Linux.

Source server: 192.168.1.1
Destination server: 192.168.1.10
File-size: 50GB
Filename: tech.dump


[root@sankar-paas ~]#nohup scp -r Tech.dump  techuser@192.168.1.10:/sankar-svn
nohup: appending output to `nohup.out'
skodipilla@192.168.1.10's password:     after password just press Ctrl+z

[1]+  Stopped                 nohup scp -r Tech.dump techuser@192.168.1.10:/sankar-svn

Then finally run below command.

[root@sankar-paas ~]# bg
[1]+ nohup scp -r Tech.dump techuser@192.168.1.10:/sankar-svn  &