OPS345 Lab 6

• Email overview
• Create a new VM named 'email' in vpc-ops345, 10.3.45.12, with an extra 4GB EBS volume, ops345sgemail, email.asmith15.ops345.ca
• ssh only from ops345sgprivate
• add an iptables rule on router to forward port 2212 to email:22, don't forget to edit ops345sg
• email_public_ip
• add A record for email now since it will take some time to propagate
• add MX email.asmith15.ops345.ca.[1]
• test on router first, records are cached for 60 minutes. test on www second, email third, finally make sure it works on the workstation
• same instructions as for vg_www-lv_www but vg_email-lv_email, mounted on /home
• but also mount it on /tmp/home, and move everything from /home to /tmp/home before rebooting
  • can lose access to ssh key if don't do it right - see what happens if mount on /home without

[root@email ~]# vi /etc/fstab 
[root@email ~]# mount /home/
[root@email ~]# ls /home/
lost+found
# try to ssh now, it won't work
[root@email ~]# umount /home/
[root@email ~]# mkdir /tmp/home
[root@email ~]# mount /dev/mapper/vg_email-lv_email /tmp/home/
[root@email ~]# cd /home/
[root@email home]# ls -a
.  ..  andrew
[root@email home]# mv andrew/ /tmp/home/
[root@email home]# cd /
[root@email /]# ls /home/
[root@email /]# ls /tmp/home/
andrew  lost+found
[root@email /]# umount /tmp/home/
[root@email /]# ls /tmp/home/
[root@email /]# ls /home/
[root@email /]# mount /home/
[root@email /]# ls -a /home/andrew/
.  ..  .bash_history  .bash_logout  .bash_profile  .bashrc  .ssh
[root@email /]# reboot

• Confirm confirm can still log in. if not: have to rebuild email vm
• The LV on a separate storage device is as valuable as the www LV. If the Vm is lost or damaged: EBS device is still there, and it's also easier to back up.
• connect to myseneca email using thunderbird on linux mint
• postfix is installed by default, but only used for localhost
• instal dovecot to get dovecot-lda
• /etc/postfix/main.cf:
  • mydomain = asmith15.ops345.ca
  • myorigin = $mydomain
  • inet_interfaces = all
  • mydestination include mydomain
• restart postfix
• ss -atnp
• add access to port 25 from anywhere in ops345sgemail
• test using telnet from workstation
• send email from myseneca to asmith15@asmith15.ops345.ca
• check /var/log/maillog
• check ~/
• check /var/mail
• /etc/postfix/main.cf: mailbox_command = /usr/libexec/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT"
• /etc/dovecot/conf.d/10-mail.conf: mail_location = maildir:~/Maildir
• check /var/mail
• check ~/
• server can now receive email. cannot send reliably yet, and need to set up dovecot for imap (next lab)
• create an alias for root: andrew, run newaliases