[email protected]# show
 interfaces {
     ethernet eth0 {
         address 172.16.34.2/29
         duplex auto
         hw-id 00:0c:29:43:a7:6f
         smp-affinity auto
         speed auto
     }
     loopback lo {
     }
 }
 protocols {
     static {
         route 0.0.0.0/0 {
             next-hop 172.16.34.6 {
             }
         }
     }
 }
 service {
     ssh {
         port 22
     }
 }
 system {
     config-management {
         commit-revisions 20
     }
     host-name vyos
     login {
         user vyos {
             authentication {
                 encrypted-password $1$UFAEObc2$M.HSpBZlFTK/kDdKbjlCR1
                 plaintext-password ""
             }
             level admin
         }
     }
     name-server 172.16.254.31
     name-server 172.16.254.32
     ntp {
         server 0.pool.ntp.org {
         }
         server 1.pool.ntp.org {
         }
         server 2.pool.ntp.org {
         }
     }
     syslog {
         global {
             facility all {
                 level notice
             }
             facility protocols {
                 level debug
             }
         }
     }
     time-zone UTC
 }

[email protected]# rollback 1
Proceed with reboot? [confirm][y]
Couldn't open /opt/vyatta/etc/config/archive/config.boot - Permission denied at /opt/vyatta/share/perl5/Vyatta/ConfigMgmt.pm line 108.