[SOLVED] LXC and Centos6 - problems with su and mysqld

[raider700]

Hello together,i have some problems with the usage of LXC on Proxmox 4.The plan is to generate a minimal LAMP containers for multiple websites.At the moment i got stucked at the basics and i'm not able to detect the source of the problem:* su ... fails* service mysqld start ... failsThe container was created with the following command:

pct create 104 container_v:vztmpl/centos-6-default_20150829_amd64.tar.xz --hostname  centos6 --password XXXXXXXX --rootfs container_v:0 --pool container_v --cpulimit 1 --cpuunits 1024 --memory 256 --swap 512

-----------------------------------------To the first problem with su :Then i entered the container and tried to change the user:

proxmox00a:/etc/pve/lxc# pct start 104proxmox00a:/etc/pve/lxc# pct enter 104[centos6 /]# useradd testuser[centos6 /]# su testusersu: /bin/bash: Permission denied

There is no additional information in the logfiles.The output of the strace uploaded to pastebin: pastebin.com/dAkZczbPIs there any LXC.* Option to change the behavior?(The correct position is /etc/pve/lxc/.conf right?)-----------------------------------------The second problem with mysqld is also strange.When i try to start i geht the following message:

bash-4.1# service mysqld startMySQL Daemon failed to start.Starting mysqld:                                           [FAILED]bash-4.1# tail -n 15 /var/log/mysqld.log 151122 13:04:09 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended151122 13:05:03 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql/usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist151122 13:05:03 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it./usr/libexec/mysqld: Can't create/write to file '/tmp/ib84Fdgq' (Errcode: 13)151122 13:05:03  InnoDB: Error: unable to create temporary file; errno: 13151122 13:05:03 [ERROR] Plugin 'InnoDB' init function returned error.151122 13:05:03 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.151122 13:05:03 [ERROR] Can't start server : Bind on unix socket: Permission denied151122 13:05:03 [ERROR] Do you already have another mysqld server running on socket: /var/lib/mysql/mysql.sock ?151122 13:05:03 [ERROR] Aborting151122 13:05:03 [Note] /usr/libexec/mysqld: Shutdown complete151122 13:05:03 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

The permission for the /tmp folder seams to be rightchown root:root /tmp; chmod 1777 /tmp)

bash-4.1# ls -lisa /tmp/total 108220755  4 drwxrwxrwt  2 root root  4096 Nov 22 12:09 .155002  4 drwxr----- 21 root root  4096 Nov 22 12:26 ..220763 64 -rw-r--r--  1 root root 59131 Nov 22 11:39 mysql-strace.txt220765 36 -rw-r--r--  1 root root 30915 Nov 22 12:09 su-strace.txt

Maybe there is also only a problem with some missing LXC settings.The strace of the start is also on pastebin: pastebin.com/8HUnw0Sy-----------------------------------------I hope someone can help me with the problems.Kindly regards,Raider700

 

[raider700]

Re: LXC and Centos6 - problems with su and mysqld

I could identify the problem:
The creation with a size of "0GB" doesn't create a image file.
The the files of the system is visible on the host without a loop mount (we need that)

Is there any way to create the visible filesystem but don't break the permissions?

 

[raider700]

Re: LXC and Centos6 - problems with su and mysqld

Thx to the support for the fast response and the solution!
Problem was the NFS option "no_root_squash" on the NFS Server and the permissions of the root folder in the container (chmod 755 /).

 

[wbumiller]

Was a bug in the creation of size=0 storages. A while ago we started using stricter permissions in our storage backend resulting in `rwxr-----` on the container's root when it is a directory. Fix is about to be committed to git. In the mean time the above mentioned `chmod` followed by a restart of the container (or doing it on the $storage/images/$vmid/vm-$vmid-disk-1.subvol directory before starting it) should do the trick.