[Lxc-users] lxc-centos/lxc-rhel?

[Dwight Engen]

On Mon, 30 Sep 2013 23:18:59 +0200
Tamas Papp <tompos at martos.bme.hu> wrote:

> On 09/30/2013 08:37 PM, Michael H. Warfield wrote:
> 
> 
> Dwight,
> 
> Actually I have a problem with the Oracle template.
> I have a a couple of Oracle Linux containers and they are running
> fine. There are running Oracle Databases as well...
> 
> But I cannot run anything through an ssh session noninteractively or
> copy files to the containers by scp as a destionation.
> 
> Eg.:
> 
> $ ssh container echo
> $ scp file container:
> 
> It's waiting for something and I could not find out.

Hi Tamas, sorry, I know you brought this up before and I wasn't sure if
you got it solved or not. First off the host doesn't know the
container by name so unless you've done something special the resolving
of "container" isn't going to just work (ie. "ping container" should fail
to resolve to an IP). You can use a recent version of lxc-info to get
the containers' IP. Here is a session I just did in Ubuntu that I think
is similar to what you are trying to do:

root at xubu:~# lxc-create -n ol -t oracle -- -u ftp://mymirror/ol-public-yum
<lots of output>
root at xubu:~# lxc-start -d -n ol
<wait a few seconds for it to start>
root at xubu:~# lxc-info -n ol
state:  RUNNING
pid:    8685
ip:     10.0.3.163
root at xubu:~# ssh 10.0.3.163
The authenticity of host '10.0.3.163 (10.0.3.163)' can't be established.
RSA key fingerprint is 2c:1a:82:14:24:72:c5:41:db:3e:b8:65:f9:c6:7e:35.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.3.163' (RSA) to the list of known hosts.
<long pause here...>
root at 10.0.3.163's password: 
[root at ol ~]# vi /etc/ssh/sshd_config
<set GSSAPIAuthentication no>
[root at ol ~]# halt
<container shuts down>
root at xubu:~# lxc-start -d -n ol
root at xubu:~# ssh 10.0.3.163
root at 10.0.3.163's password: 
Last login: Wed Oct  2 11:09:07 2013 from 10.0.3.1
[root at ol ~]# 
[root at ol ~]# exit
logout
Connection to 10.0.3.163 closed.
root at xubu:~# scp 10.0.3.163:/etc/fstab .
root at 10.0.3.163's password: 
bash: scp: command not found
<This is because openssh-clients wasn't installed in the container, so
 we have to go install that. I think I should add that to be installed
 by default in the template>
root at xubu:~# ssh 10.0.3.163
root at 10.0.3.163's password: 
Last login: Wed Oct  2 11:11:38 2013 from 10.0.3.1
[root at ol ~]# echo "192.168.1.30 mymirror" >>/etc/hosts
[root at ol ~]# yum install openssh-clients
<lots of yum output>
[root at ol ~]# exit
logout
Connection to 10.0.3.163 closed.
root at xubu:~# scp 10.0.3.163:/etc/fstab .
root at 10.0.3.163's password: 
fstab
100%    0     0.0KB/s   00:00    
root at xubu:~# 
root at xubu:~# scp fstab 10.0.3.163:
root at 10.0.3.163's password: 
fstab
100%    0     0.0KB/s   00:00    

So I hopefully your situation is similar and disabling the
GSSAPIAuthentication or setting UseDNS no in the containers sshd_config
will reduce the wait times. Also, the openssh-clients package has to be
installed in the container for scp to work. For now you can manually
install it in the container using yum or the -r option to the template
when creating a new OL container. I'll submit a patch for the template
that includes that package by default so scp in/out will work out of
the box.

> The system is Ubuntu (12.04 and 13.04). Don't you have this error?
> 
> 
> Thanks,
> tamas