Greetings,
----- Original Message -----
> Dear OpenVZ users,
>
> I've got a questions concerning RHE7/CENTOS7 containers and the
> change in the script "/etc/vz/dists/scripts/redhat-set_hostname.sh"
> which comes with the newer versions of vzctl-core...
>
> function set_hostname()
> {
> local cfgfile="$1"
> local var=$2
> local val=$3
>
> [ -z "${val}" ] && return 0
>
> if [ -f /etc/hostname ]; then
> # New style: RHEL7/Fedora15+
> # Note hostname(5) says it should NOT be FQDN
> val=${val%%.*}
> echo "$val" > /etc/hostname
> else
> # "Classic" style
> put_param "${cfgfile}" "${var}" "${val}"
> fi
>
> hostname "${val}"
> }
>
> change_hostname /etc/hosts "${HOSTNM}" "${IP_ADDR}"
>
>
> We've got some CENTOS7 containers for testing (running on Hardware
> with rhel6 openvz kernel at the moment) The hostname which should be
> FQDN in our environment is set to short hostname all the time. This
> happens because the file/etc/hostname exists in Centos 7.
>
> The redhat-set_hostname.sh script changes our entry /etc/hostname to
> short hostname...
>
> When I read the man pages of my COS 7.1.1503 Container, I don't see
> any entry saying that hostname should not be FQDN....
>
> Hostname(5) says that it is recommended but, not that it is a strict
> requirement...
>
> DESCRIPTION
> The /etc/hostname file configures the name of the local system
> that is set during boot using the sethostname(2) system call.
> It should contain a single newline-terminated hostname string.
> The
> hostname may be a free-form string up to 64 characters in
> length; however, it is recommended that it consists only of
> 7-bit ASCII lower-case characters and no spaces or dots, and
> limits itself to
> the format allowed for DNS domain name labels, even though this
> is not a strict requirement.
>
> Hostname(1) says the following...
>
> FILES
> /etc/hostname Historically this file was supposed to only
> contain the hostname and not the full canonical FQDN. Nowadays
> most software is able to cope with a full FQDN here. This file
> is read at
> boot time by the system initialization scripts to set the
> hostname.
>
> So why do you prevent users from setting their hostname to
> fqdn-hostname with the change of the script above?
I have a RHEL6 physical host and it does not have an /etc/hostname file. Where
does the system get its hostname from then? From /etc/sysconfig/network with a
HOSTNAME= line and yes the FQDN is in there.
On RHEL7 it is different. systemd provides a tool for setting the hostname
(hostnamectl which stores the FQDN in /etc/hostname) and typically (on a
physical host anyway) NetworkManager is used. Since EL7 containers don't use
NetworkManager, putting the hostname in /etc/sysconfig/network and/or
/etc/hostname should work. In fact shortly after CentOS 7.0 OS Template as
released I filed a bug because hostnamectl putting it in /etc/hostname was
being ignored so they fixed that.
So to answer your question, EL6 doesn't use /etc/hostname.
TYL,
--
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
_______________________________________________
Users mailing list
Users@openvz.org
https://lists.openvz.org/mailman/listinfo/users
