Clarify Jails

K

klabacita

Hi my friends.

I have search about this doubts I have but still don't have a clear answer:

1; Jails disk space, if I have a partition called /jails, there I put 1 jail called www,
this jail can grow until eat all my physical partition?
2; Once u have your jails running, If u want to make buildworld + cutstom kernel, the only way to make this is inside the host system or u can do it inside the jail?
3; U can run any service inside the jail, speaking about:

mail server->postifix/dovecot
web server-->apache+php
databases->postgresql/mysql
spam->spamassassin+clamd

Their is no limit here?
4; Normally I see examples that point /usr to hold the jails, but I prefer to use a partition alone example:/jails, this will not cause issues?

Running freebsd 8.0 i386.

Thanks all for your time :)!!!
 
mmm, I had read the handbook but didn't seen to answer my questions and read a lot of doc from googly and nothing to satisfied my questions.

Thanks!!!
 
klabacita said:
1]

Yes. AFAIK, this problem has not been solved yet. From jail(8):
Code: 
     Multiple jails sharing the same file system can influence each other.
     For example a user in one jail can fill the file system also leaving no
     space for processes in the other jail.  Trying to use quota(1) to prevent
     this will not work either as the file system quotas are not aware of
     jails but only look at the user and group IDs.  This means the same user
     ID in two jails share the same file system quota.	One would need to use
     one file system per jail to make this work.

klabacita said:
2]

From the host system only. Search the forums here. There should be a few different threads on how to update jails after updating the host system.

klabacita said:
4]

That is fine.
Click to expand...
Click to expand...
Click to expand...
 
Jails can use a file for a "file system". I saw a site that describe this but I can find it anymore. Does anyone have the instructions?
 
Thanks JimW for the FBSD 8 link. The one I saw was for FBSD 7, but since I moved to 8 I needed the one you posted.
 
rbelk said:
Thanks JimW for the FBSD 8 link. The one I saw was for FBSD 7, but since I moved to 8 I needed the one you posted.
Click to expand...

You're Welcome.. but.. don't thank me. I got the link from a recent post from ccaptainhastings3 and bookmarked it thinking I would do some tinkering in the near future. :)
 
anomie said:
Yes. AFAIK, this problem has not been solved yet. From jail(8):
Code: 
     Multiple jails sharing the same file system can influence each other.
     For example a user in one jail can fill the file system also leaving no
     space for processes in the other jail.  Trying to use quota(1) to prevent
     this will not work either as the file system quotas are not aware of
     jails but only look at the user and group IDs.  This means the same user
     ID in two jails share the same file system quota.	One would need to use
     one file system per jail to make this work.
Click to expand...

The solution to this problem is ZFS.



From the host system only. Search the forums here. There should be a few different threads on how to update jails after updating the host system.



That is fine.
Click to expand...
 
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