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If you are still using CentOS 6, you need to install the EPEL repo for Let's Encrypt to work. For that you need to run the following command.

# yum -y install epel-release

Download the Let's Encrypt files using Git:

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1.  Run the following command:

   Shell
   # service voipnow stop

   
   

2. Disable the srvmonitor cron task by running the command below 

   Shell
   # crontab -e

   and place a # character in front of the line containing srvmonitor.

   
   

Run the Let's Encrypt script

# cd letsencrypt

# ./letsencrypt-auto certonly -a standalone -d sip.voipnowserver.com

hecking for new version...

Creating virtual environment...

Installing Python packages...

Installation succeeded.

Requesting root privileges to run letsencrypt...

   /root/.local/share/letsencrypt/bin/letsencrypt certonly -a standalone -d sip.voipnowserver.com

  DeprecationWarning

Version: 1.1-20080819

Version: 1.1-20080819

At this point, you will be prompted to provide a valid email address and accept the legal terms. Proceed as required, and the script should continue.

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Back up the old SSL certificate

# cp -p /etc/voipnow/certs/http.pem /etc/voipnow/certs/http.pem.bkp

Copy the new certificate and key

# cd /etc/letsencrypt/live/sip.voipnowserver.com/

# cat privkey.pem fullchain.pem > /etc/voipnow/certs/http.pem

Start the web interface

# service voipnow start

Check if you can access the web interface and ensure that the SSL connection information is correct.

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If everything's OK, run the command below again

# crontab -e

and remove the # sign placed in front of the srvmonitor command.

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