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Re: [Samba] Samba Active Directory Domain Controller

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On 08/05/17 19:11, lingpanda101 via samba wrote:
>>> I believe Rowland is speaking specifically to CentOS 7.3 and not
>>> Ubuntu. CentOS requires network config changes in
>>> /etc/sysconfig/network-scripts/ifcfg-"Your Interface"
>>> I can't recall where in CentOS to make changes to resolv.conf.
>> What I was trying to point out was that I couldn't change anything
>> in /etc on Centos 7.3, I wasn't allowed to. I couldn't change something
>> on my own computer because somebody, somewhere has decided I shouldn't.
>> I can guess what it is, but without in depth investigation, I cannot
>> point the finger at anything.
>> All I wanted to do was change the nameserver, but, as I said, I wasn't
>> allowed to.
>> I would also like to point out I know where to put the settings, if I
>> am changing them permanently, even on a raspberry pi ;-)
>> Rowland
> Where do you make the changes on CentOS to update resolv.conf? OP should
> verify his isn't being overwritten. Thanks.

I may be a bit too late jumping on this thread but here are a few pointers:

1. /etc/resolve.conf is automagically generated/updated by NetworkManager

2. any DNS entries in ifcfg files in /etc/sysconfig/network-scripts get
put in /etc/resolve.conf by NetworkManager

3. systemd can be set to mount the system filesystems read-only. This
can be checked in /etc/sysconfig/readonly-root. I tried to look for more
info on read-only rootfs but found only bug reports ;). I have also
heard talk that people have found their /etc as read-only after a CentOS
7 update - personally I have not experienced it.

While tempting to just disable NetworkManager and configure your network
scripts and resolve.conf any which way you like I ran into a problem
where after the latest systemd update the boot time unit ordering is
broken and any services trying to bind to an IP:PORT combo will
fail[1][2]. E.g. having SSHD configured with ListenAddress
XXX.XXX.XXX.XXX:22 will fail to start as systemd will try to bring up
the service before the network-online target.

The fix is to either drop-in a systemd unit override or to add a target
dependency. According to readhat fix is on the way.

[1] - https://bugzilla.redhat.com/show_bug.cgi?id=1438749
[2] - https://bugs.centos.org/view.php?id=13146

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