Zimbra Open Source Certificate Renew

If you encounter error on Zimbra Open Source certificate expiry, then just run the following lines:

1. Switch to Zimbra user
su - zimbra
2. Stop all the Zimbra services
zmcontrol stop
3. Get out from zimbra user.
exit
4. Begin by generating a new Certificate Authority (CA).
/opt/zimbra/bin/zmcertmgr createca -new 
5. Then generate a certificate signed by the CA that expires in 365 days.
/opt/zimbra/bin/zmcertmgr createcrt -new -days 365
6. Next deploy the certificate.
/opt/zimbra/bin/zmcertmgr deploycrt self
7. Next deploy the CA.
/opt/zimbra/bin/zmcertmgr deployca
8. To finish, verify the certificate was deployed to all the services.
/opt/zimbra/bin/zmcertmgr viewdeployedcrt
9. Switch back to zimbra user
su - zimbra
10. Start all Zimbra services
zmcontrol start