vdsm creates persistant network configs that overwrite manual changes at reboot in /var/lib/vdsm/persistence/netconf You can check your other hosts for any differences there. It is recommended that networks are set up and managed through ovirt engine. On Sun, Sep 22, 2019 at 6:01 AM TomK <tomkcpr@mdevsys.com> wrote:

This occurs on only one of the oVirt hosts in my cluster. -- Thx, TK.

On 9/22/2019 12:08 AM, TomK wrote:

...

Hey All,

My ifcfg-bond0 is getting overwritten on reboot. Need to add a search string to the configuration.

What's overwriting it and should I be trying to add a search string to another location?

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Thanks All! Ok, so configured auditd to watch /etc/resolv.conf and that pointed out the problem. A host that was reverting my changes had these /etc/resolv.conf* files: [root@mdskvm-p01 etc]# grep -EiR "# Generated by NetworkManager" * grep: extlinux.conf: No such file or directory resolv.conf:# Generated by NetworkManager resolv.conf.save:# Generated by NetworkManager # <<<<<<<<<<<<<<< [root@mdskvm-p01 etc]# [root@mdskvm-p01 etc]# grep -Ei search resolv.conf resolv.conf.save resolv.conf:search mds.xyz nix.mds.xyz mws.mds.xyz resolv.conf.save:search mds.xyz [root@mdskvm-p01 etc]# and a host where changes to /etc/resolv.conf were not occurring, had these files (note the missing .save file): [root@mdskvm-p02 etc]# grep -EiR "# Generated by NetworkManager" * grep: extlinux.conf: No such file or directory resolv.conf:# Generated by NetworkManager resolv.conf-original:# Generated by NetworkManager [root@mdskvm-p02 etc]# The reason why /etc/resolv.conf was reverting on the first host is because there is a line in the following ifdown-post network script that overwrites /etc/resolv.conf from /etc/resolv.conf.save, if you have it: [root@mdskvm-p02 network-scripts]# vi ifdown-post . . . # Remove duplicate DNS entries and shift them, # to have always correct condition below... update_DNS_entries if ! is_false "${PEERDNS}" || is_true "${RESOLV_MODS}" && \     [ "${DEVICETYPE}" = "ppp" -o "${DEVICETYPE}" = "ippp" -o -n "${DNS1}" \     -o "${BOOTPROTO}" = "bootp" -o "${BOOTPROTO}" = "dhcp" ] ; then     if [ -f /etc/resolv.conf.save ]; then # <<<<<<<<<<<<<<<<<<<<<         change_resolv_conf /etc/resolv.conf.save         rm -f /etc/resolv.conf.save # <<<<<<<<<<<<<<<<<<<<<     fi     if [ "${DEVICETYPE}" = "ppp" -o "${DEVICETYPE}" = "ippp" ]; then         if [ -f /etc/ppp/peers/$DEVICE ] ; then             rm -f /etc/ppp/peers/$DEVICE         fi     fi fi . . . . And the function change_resolv_conf() effectively copies the contents of /etc/resolv.conf.save over /etc/resolv.conf thereby overwriting anything in it, if it exists (See # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< markers below ): [root@mdskvm-p02 network-scripts]# vi network-functions # Invoke this when /etc/resolv.conf has changed: change_resolv_conf () { s=$(/bin/grep '^[\ \ ]*option' /etc/resolv.conf 2>/dev/null) if [ $# -gt 1 ]; then if [ "x$s" != "x" ]; then s="$s"$'\n' fi n_args=$# while [ $n_args -gt 0 ]; do case "$s" in *$1*) shift n_args=$(($n_args-1)) continue ;; esac s="$s$1" shift if [ $# -gt 0 ]; then s="$s"$'\n' fi n_args=$(($n_args-1)) done elif [ $# -eq 1 ]; then if [ "x$s" != "x" ]; then s="$s"$'\n'$(/bin/grep -vF "$s" $1) else # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< s=$(cat $1) fi # <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< fi (echo "$s" > /etc/resolv.conf) >/dev/null 2>&1; # <<<<<<<<<<<<<<<<< r=$? if [ $r -eq 0 ]; then [ -x /sbin/restorecon ] && /sbin/restorecon /etc/resolv.conf

/dev/null 2>&1 # reset the correct context /usr/bin/logger -p local7.notice -t "NET" -i "$0 : updated /etc/resolv.conf" [ -e /var/run/nscd/socket ] && /usr/sbin/nscd -i hosts # invalidate cache fi return $r }

So you have to modify both files in order to persist the changes or simply remove the /etc/resolv.conf.save file..... Appears when some older interface parameters were used before I installed oVirt here, they triggered creation of the .save file. Because it exists, it's simply used by default. Hence why changes directly to /etc/resolv.conf persisted on the second host: it didn't have a /etc/resolv.conf.save file. Cheers, TK More notes and configuring auditd to watch changes to /etc/resolv.conf: https://tinyurl.com/y68dgecx On 9/22/2019 11:08 AM, Bell Levin wrote:

Hey, I would like to add a small point to Edward's explanation.

If the config does really get overwritten, it probably means that more was changed to the bond but the search string. If indeed what you are looking for is to add a dns search line, you should add it to /etc/resolv.conf.

On Sun, Sep 22, 2019 at 4:44 PM Edward Berger <edwberger@gmail.com <mailto:edwberger@gmail.com>> wrote:

vdsm creates persistant network configs that overwrite manual changes at reboot in /var/lib/vdsm/persistence/netconf

You can check your other hosts for any differences there.

It is recommended that networks are set up and managed through ovirt engine.

On Sun, Sep 22, 2019 at 6:01 AM TomK <tomkcpr@mdevsys.com <mailto:tomkcpr@mdevsys.com>> wrote:

This occurs on only one of the oVirt hosts in my cluster. -- Thx, TK.

On 9/22/2019 12:08 AM, TomK wrote: > Hey All, > > My ifcfg-bond0 is getting overwritten on reboot.  Need to add a search > string to the configuration. > > What's overwriting it and should I be trying to add a search string to > another location? > _______________________________________________ Users mailing list -- users@ovirt.org <mailto:users@ovirt.org> To unsubscribe send an email to users-leave@ovirt.org <mailto:users-leave@ovirt.org> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/K5QTMQX4OGCKQZ...

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-- Thx, TK.