Jail Already Exists

dweimer dweimer at dweimer.net
Tue Apr 21 15:46:13 UTC 2015

At some point in the past I learned the trick of dropping TCP 
connections that were left open to clear processes that were not 
allowing a jail that had been shutdown to be restarted. Does anyone know 
other things that could cause a jail to be held open? I have one that I 
am unable to start, without rebooting the entire server? In this 
particular instance, It wouldn't be a big deal for me to bounce the 
server, nor is it an issue leaving the jail down for a while to 
experiment. However on some other servers both of these would be an 
issue so I figured now is a good time to experiment with finding a 

root at freebsd:/jails/proxy # jls
    JID  IP Address      Hostname                      Path
      1     pgsql.dweimer.local           /jails/pgsql/ROOT
      2     mysql.dweimer.local           /jails/mysql/ROOT
      3     webmail.dweimer.local         
      4     bacula.dweimer.local          /jails/bacula/ROOT
      5     unifi.dweimer.local           /jails/unifi/ROOT
root at freebsd:/jails/proxy # jail -c proxy
jail: proxy: jail 6 already exists

jail 6's IP is

netstat -an | grep ""

finds no results.

The jail simply runs a Squid proxy service, I have verified that there 
isn't a hung up squid process. I have also verified that there are no 
hung up python processes since I use a Python script as a log daemon to 
write the Squid logs into a PostgreSQL database on jail 1. I am not sure 
what else to check for.

    Dean E. Weimer

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