Re: [ovirt-users] Ovirt Hosted-Engine VM iptables
I can add a rule into ipdates such as this iptables -I INPUT -s 192.168.0.10 -p tcp -m tcp --dport 5666 -j ACCEPT I can see the addition has succeeded with this iptables-save > /etc/sysconfig/iptables But a reboot of the Engine VM (not the Host) doesn't keep the new rule, and I was expecting that during bootup CentOS would read from /etc/sysconfig/iptables. Alas it isn't. Found a solution. After reading this https://stackoverflow.com/questions/24756240/how-can-i-use-iptables-on-cento... I installed iptables-services But once installed I found that iptables -L showed no rules. thankfully I still had the default hosted-engine rules in /etc/sysconfig/iptables iptables-restore < /etc/sysconfig/iptables Then..... service iptables save restored the default hosted-engine rules including my rule for 5666. Rebooting the hosted-engine VM and my rule 5666 for NRPE is still there. Success!! To answer your other questions
Did you ask to configure the firewall during engine-setup? Yes. Looks like it setup firewalld for me.
Alternatively, it's recommended to use firewalld. For the moment I have disabled firewalld and are using iptables....Is there a reason why firewalld is preferred over iptables?
Kind regards Andrew ------ Original Message ------ From: "Yedidyah Bar David" <didi@redhat.com> To: "Andrew Dent" <adent@ctcroydon.com.au> Cc: "users" <users@ovirt.org> Sent: 29/05/2017 9:26:23 PM Subject: Re: [ovirt-users] Ovirt Hosted-Engine VM iptables
On Mon, May 29, 2017 at 1:14 PM, Andrew Dent <adent@ctcroydon.com.au> wrote:
Hi
I would like to add rules into the iptables of the Hosted Engine VM in Ovirt. I am wanting to monitor the Ovirt Engine using Nagios -> NRPE and I would like to open port 5666
the version is oVirt Engine Version: 4.1.1.8-1.el7.centos I have tried using the normal process for iptables (iptables-save etc), but it seems that the file /etc/sysconfig/iptables is ignored when the Ovirt Engine VM starts.
What do you mean in "ignored"?
What's the output of 'iptables-save'?
Did you ask to configure the firewall during engine-setup?
How can I add permanent iptables rules into the Engine VM?
On the engine vm (unlike hosts), the only thing that touches iptables is engine-setup. Before doing that it asks you if you want to configure the firewall. There aren't currently means to add your custom rules - either you manage it all by yourself or you let engine-setup do that.
Alternatively, it's recommended to use firewalld. engine-setup can add to firewalld the stuff it wants, and you still can add your own stuff.
If I got you wrong and you refer to the hosts (not engine), see also:
https://www.ovirt.org/blog/2016/12/extension-iptables-rules-oVirt-hosts/
Best,
Kind regards
Andrew
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-- Didi
On Tue, May 30, 2017 at 8:56 AM, Andrew Dent <adent@ctcroydon.com.au> wrote:
I can add a rule into ipdates such as this iptables -I INPUT -s 192.168.0.10 -p tcp -m tcp --dport 5666 -j ACCEPT I can see the addition has succeeded with this iptables-save > /etc/sysconfig/iptables
But a reboot of the Engine VM (not the Host) doesn't keep the new rule, and I was expecting that during bootup CentOS would read from /etc/sysconfig/iptables. Alas it isn't.
Found a solution. After reading this https://stackoverflow.com/questions/24756240/how-can-i-use-iptables-on-cento... I installed iptables-services But once installed I found that iptables -L showed no rules. thankfully I still had the default hosted-engine rules in /etc/sysconfig/iptables iptables-restore < /etc/sysconfig/iptables Then..... service iptables save restored the default hosted-engine rules including my rule for 5666.
Rebooting the hosted-engine VM and my rule 5666 for NRPE is still there. Success!!
Glad for that. Indeed a change between el6 and el7 is the addition of the package iptables-services. For quite a long time, we install this package during engine-setup [1] if available, but only after we ask about the firewall - so if it's not installed beforehand engine-setup won't let you choose iptables. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1224799
To answer your other questions
Did you ask to configure the firewall during engine-setup? Yes. Looks like it setup firewalld for me.
You can check that in the setup logs. If firewalld was active (up) when you ran engine-setup, and you replied 'Yes' to 'Configure firewall?', then it automatically chose firewalld, with the assumption that if it's up, it's very likely what you want. It also emits a line about this.
Alternatively, it's recommended to use firewalld. For the moment I have disabled firewalld and are using iptables....Is there a reason why firewalld is preferred over iptables?
Main reason from our (as developers) POV is that it's modular - allows adding/removing services programmatically, without having to parse and understand /etc/sysconfig/iptables. Obviously some people also prefer it for other reasons - ease of use, not having to know all the details for each specific services, etc. Best,
Kind regards
Andrew
------ Original Message ------ From: "Yedidyah Bar David" <didi@redhat.com> To: "Andrew Dent" <adent@ctcroydon.com.au> Cc: "users" <users@ovirt.org> Sent: 29/05/2017 9:26:23 PM Subject: Re: [ovirt-users] Ovirt Hosted-Engine VM iptables
On Mon, May 29, 2017 at 1:14 PM, Andrew Dent <adent@ctcroydon.com.au> wrote:
Hi
I would like to add rules into the iptables of the Hosted Engine VM in Ovirt. I am wanting to monitor the Ovirt Engine using Nagios -> NRPE and I would like to open port 5666
the version is oVirt Engine Version: 4.1.1.8-1.el7.centos I have tried using the normal process for iptables (iptables-save etc), but it seems that the file /etc/sysconfig/iptables is ignored when the Ovirt Engine VM starts.
What do you mean in "ignored"?
What's the output of 'iptables-save'?
Did you ask to configure the firewall during engine-setup?
How can I add permanent iptables rules into the Engine VM?
On the engine vm (unlike hosts), the only thing that touches iptables is engine-setup. Before doing that it asks you if you want to configure the firewall. There aren't currently means to add your custom rules - either you manage it all by yourself or you let engine-setup do that.
Alternatively, it's recommended to use firewalld. engine-setup can add to firewalld the stuff it wants, and you still can add your own stuff.
If I got you wrong and you refer to the hosts (not engine), see also:
https://www.ovirt.org/blog/2016/12/extension-iptables-rules-oVirt-hosts/
Best,
Kind regards
Andrew
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