Red Hat Bugzilla – Bug 974306
Check if required ports are open at start of freeipa-server-install
Last modified: 2015-02-18 08:56:30 EST
Description of problem:
Check if required ports are open at start of freeipa-server-install.
I had accidentally blocked access to freeipa ports and the only error I got was "unable to restart directory server" after few screens worth of debug output. It's quite hard to identify the real root of the problem that may be actually caused by one small typo far far away from the apparent error...
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. uniformly block access to port 389 (and probably other ports)
2. run ipa-server-install with correct parameters
ipa-server-install fails with screen-long backtrace about not being able to restart directory server
ipa-server-install finds out that iptables configuration is plain wrong (ports can't be reached even from localhost)
FreeIPA server installer does not interact with Firewall at the moment. Though you can check a related upstream ticket which requests it:
Even when we get to this ticket (patches welcome though), I am not sure if we can easily find out the bad configuration you just pointed out. Or are you aware of some command/API which would be able to get us this information? i.e. something that would tell us - "is port X open on loopack?"
We print list of ports that need to be open after the install and we also correctly detected that there is problem with DS restart (after we checked if the port was open after the restart - it was not). Thus, I am not convinced yet if we can improve current state (besides adding firewalld handling as proposed in ticket 2110).
(In reply to Martin Kosek from comment #1)
> FreeIPA server installer does not interact with Firewall at the moment.
> Though you can check a related upstream ticket which requests it:
firewalld integration is by far the best thing to do, especially because the required port range can be different across different instances - the main ipa service could then request ports to be open dynamically just for currently running services
> Even when we get to this ticket (patches welcome though), I am not sure if
> we can easily find out the bad configuration you just pointed out. Or are
> you aware of some command/API which would be able to get us this
> information? i.e. something that would tell us - "is port X open on loopack?"
I check the ports manually using nmap but I understand that this is hardly an option for the installer. You could create a threat that would bind() the required ports and try to connect() to the ports from main thread but that might be way too much work for little benefit, especially after firewalld integration. So the correct approach would be better error handling:
> We print list of ports that need to be open after the install
The problem was typo in an iptables setup so I was convinced that my firewall is OK while it wasn't...
> and we also
> correctly detected that there is problem with DS restart (after we checked
> if the port was open after the restart - it was not).
This sounds to me as two totally unrelated things - if I see the backtrace ending at not being able to restart some service, I certainly don't expect that the core reason is that the port can not be accessed.
> Thus, I am not
> convinced yet if we can improve current state (besides adding firewalld
> handling as proposed in ticket 2110).
I think you definitely can: if you fail to connect to some service that should be accessible at that point, report it and fail the installation at that very moment.
(In reply to David Jaša from comment #2)
> I think you definitely can: if you fail to connect to some service that
> should be accessible at that point, report it and fail the installation at
> that very moment.
That's right. I reproduced your issue with following configuration on my F19 box:
# cat /etc/sysconfig/iptables
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
#-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
# ipa-server-install -p kokos123 -a kokos123
[2/4]: writing configuration
[3/4]: configuring ntpd to start on boot
[4/4]: starting ntpd
Done configuring NTP daemon (ntpd).
Configuring directory server (dirsrv): Estimated time 1 minute
[1/37]: creating directory server user
[2/37]: creating directory server instance
ipa : CRITICAL Failed to restart the directory server (). See the installation log for details.
[3/37]: adding default schema
[4/37]: enabling memberof plugin
I think I also recall screens when the installation goes much further thus loosing the original error. We should crash right when we failed to restart 389 DS. I will clone an upstream ticket.
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