I had slow bootup recently and found using systemd-analyze that postfix-service is taking almost 25 s to start, critical-chain told me it was specifically postfix@-service.
PS: I also do not know what is postfix@
Upon using journalctrl -u postfix@-.service it shows the following
Jan 28 12:24:10 aaryan-Inspiron-5577 systemd[1]: Starting Postfix Mail Transport Agent (instance -)...
Jan 28 12:24:35 aaryan-Inspiron-5577 postfix/postfix-script[1641]: warning: symlink leaves directory: /etc/postfix/./makedefs.out
Jan 28 12:24:35 aaryan-Inspiron-5577 postfix/postfix-script[1657]: warning: /var/spool/postfix/etc/resolv.conf and /etc/resolv.conf differ
Jan 28 12:24:35 aaryan-Inspiron-5577 postfix/postfix-script[1662]: warning: /var/spool/postfix/etc/ssl/certs/ca-certificates.crt and /etc/ssl/certs/ca-certificates.crt differ
One can clearly see the 25 sec time delay, however I am somewhat of lost here as what how to debug deeper as this log was not much helpful. I have an idea that somehow if I debug the system calls during the start of this service ( during boot ) and see their time lag I will be able to pin point what is the problem.
I can also just remove this service since it is a private laptop but since this might be a good exercise to learn hence I posted here!
