Helle Scott,
I know that rhel6 has no /etc/hostname and it was not my question unless you
wanted to explain that we should not run rhel7/cos7 containers on rhel6 based
openvz kernel hardware node.
It works as expected, if I remove the lines from the script
"/etc/vz/dists/scripts/redhat-set_hostname.sh" where the /etc/hostname of the
container is changed...
Greetings, Sabine
> Am 05.08.2015 um 17:51 schrieb Scott Dowdle <dow...@montanalinux.org>:
>
> 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]
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