[Lxc-users] LXC Without TTY. Why? SSH: PTY allocation request failed on channel 0

[Daniel Lezcano]

Osvaldo Filho wrote:
> Environment:
> Ubuntu 10.04 x64
> lxc 0.6.5-1
>
>
> SSH Problem: PTY allocation request failed on channel 0
>
> Where is my tty?
>
> lxc-ps --lxc
>
> CONTAINER    PID TTY          TIME CMD
> prizm1      1330 ?        00:00:00 init
> prizm1      1406 ?        00:00:00 upstart-udev-br
> prizm1      1420 ?        00:00:00 udevd
> prizm1      1427 ?        00:00:00 getty
> prizm1      1434 ?        00:00:00 getty
> prizm1      1700 ?        00:00:00 sshd
> prizm1      1702 ?        00:00:00 apache2
> prizm1      1722 ?        00:00:00 getty
> prizm1      1723 ?        00:00:00 apache2
> prizm1      1724 ?        00:00:00 apache2
> prizm1      1725 ?        00:00:00 apache2
> prizm1      1726 ?        00:00:00 apache2
> prizm1      1727 ?        00:00:00 apache2
> prizm1      1903 ?        00:00:00 apache2
>   

There is no tty assigned to these processes.
You can check it is the same on the host system.

> ---------------------------------------------------
> deskx at srv01:~$ cat (...)/rootfs/etc/init/lxc.conf
> start on startup
>
> task
> pre-start script
> mount -t proc proc /proc
> mount -t devpts devpts /dev/pts
> mount -t sysfs sys /sys
> mount -t tmpfs varrun /var/run
> mount -t tmpfs varlock /var/lock
> mkdir -p /var/run/network
> mkdir -p /var/run/sshd
> touch /var/run/network/ifstate
> touch /var/run/utmp
> chmod 664 /var/run/utmp
> chown root.utmp /var/run/utmp
> if [ "$(find /etc/network/ -name upstart -type f)" ]; then
> chmod -x /etc/network/*/upstart || true
> fi
> end script
>
> script
> start networking
> initctl emit filesystem --no-wait
> initctl emit local-filesystems --no-wait
> initctl emit virtual-filesystems --no-wait
> init 2
> end script
>
> ------------------------------------------------
> Script for correct /dev
>
> #!/bin/bash
>
> # bodhi.zazen's lxc-config
> # Makes default devices needed in lxc containers
> # modified from http://lxc.teegra.net/
>
> ROOT=$(pwd)
> DEV=${ROOT}/rootfs/dev
> if [ $ROOT = '/' ]; then
> printf "\033[22;35m\nDO NOT RUN ON THE HOST NODE\n\n"
> tput sgr0
> exit 1
> fi
> if [ ! -d $DEV ]; then
> printf "\033[01;33m\nRun this script in rootfs\n\n"
> tput sgr0
> exit 1
> fi
> rm -rf ${DEV}
> mkdir ${DEV}
> mknod -m 666 ${DEV}/null c 1 3
> mknod -m 666 ${DEV}/zero c 1 5
> mknod -m 666 ${DEV}/random c 1 8
> mknod -m 666 ${DEV}/urandom c 1 9
> mkdir -m 755 ${DEV}/pts
> mkdir -m 1777 ${DEV}/shm
> mknod -m 666 ${DEV}/tty c 5 0
> mknod -m 666 ${DEV}/tty0 c 4 0
> mknod -m 666 ${DEV}/tty1 c 4 1
> mknod -m 666 ${DEV}/tty2 c 4 2
> mknod -m 666 ${DEV}/tty3 c 4 3
> mknod -m 600 ${DEV}/console c 5 1
> mknod -m 666 ${DEV}/full c 1 7
> mknod -m 600 ${DEV}/initctl p
> mknod -m 666 ${DEV}/ptmx c 5 2
>
> exit 0
>
> -----------------------------------------------
> My config.lxc
>
> lxc.utsname = prizm1
> lxc.network.type = veth
> lxc.network.flags = up
> lxc.network.link = br0
> lxc.network.ipv4 = 192.168.1.13/24
> lxc.network.hwaddr = 00:16:EC:7E:E5:19
> lxc.network.name = eth0
> lxc.mount = /home/lxc/prizm/fstab
> lxc.rootfs = /home/lxc/prizm/rootfs
>
> lxc.tty = 0
> #lxc.pseudo = 1024
>   

Does lxc.pts=1 solves the problem ?
> #lxc.cgroup.devices.deny = a # Deny all access to devices
> # /dev/null and zero
> lxc.cgroup.devices.allow = c 1:3 rwm
> lxc.cgroup.devices.allow = c 1:5 rwm
>
> # consoles
> lxc.cgroup.devices.allow = c 5:1 rwm
> lxc.cgroup.devices.allow = c 5:0 rwm
> lxc.cgroup.devices.allow = c 4:0 rwm
> lxc.cgroup.devices.allow = c 4:1 rwm
> lxc.cgroup.devices.allow = c 4:2 rwm
> lxc.cgroup.devices.allow = c 4:3 rwm
>
> # /dev/{,u}random
> lxc.cgroup.devices.allow = c 1:9 rwm
> lxc.cgroup.devices.allow = c 1:8 rwm
> # /dev/pts/* - pts namespaces are "coming soon"
> lxc.cgroup.devices.allow = c 136:* rwm
> lxc.cgroup.devices.allow = c 5:2 rwm
> # rtc
> lxc.cgroup.devices.allow = c 254:0 rwm
>
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