I recently created a new Centos VM. When it booted, I noticed it did not have a working ethernet connection. So, I started playing with things, and got it working. Here are my notes:
Enabling an Ethernet connection on Centos7
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Category Archives: Networking
Reproducing an Open vSwitch Bridge Configuration
In the previous post, I described the setup for installing FreeIPA on a VM parallel to the undercloud VM setup by Tripleo Quickstart. The network on the undercloud VM has been setup up by Ironic and Neutron to listen on a network defined for the overcloud. I want to reproduce this on a second machine that is not enrolled in the undercloud. How can I reproduce the steps?
A TFTP Server in Rust
Rust is Pedantic. I’m Pedantic. We get along wonderfully. Since HTTP is way too overdone, I wanted to try something at the Byte twiddling level. I got a very, very basic TFTP server to run and fetch a larger binary file without corrupting it. Time to celebrate with a bragpost.
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Using Ansible to add a NetworkManager connection
The Virtual Machine has two interfaces, but only one is connected to a network. How can I connect the second one?
Creating a new Network for a dual NIC VM
I need a second network for testing a packstack deployment. Here is what I did to create it, and then to boot a new VM connected to both networks.
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OpenStack keeps resetting my hostname
No matter what I changed, something kept setting the hostname on my vm to federate.cloudlab.freeipa.org.novalocal. Even forcing the /etc/hostname file to be uneditable did not prevent this change. Hunting this down took far too long, and here is the result of my journey.
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Firewalld rule for Minecraft Server
My sons play Minecraft. I recently decided to let them play head to head on the same server. Aside from the financial aspect (I had to buy a second account) it was fairly straightforward running the server. The one thing that tripped me up was a firewall rule that prevented a remote client machine from connecting to the server. Fix was pretty simple.
Who holds the keys to the Kingdom
During the years I worked as a Web application developer, it seemed like every application had its own authentication mechanism. An application developer is thinking in terms of the domain model for their application whether it be eCommerce, Systems management, photography, or weblogs. Identity Management is a cross cutting concern, and it is hard to get right. Why, then, do so many applications have “user” tables in their databases?
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Troubleshooting a FreeIPA install:
I had a handful of machines enrolled in a demo cluster. About half of them got shut down, and now I can’t SSH into them via Kerberos tickets. Here is my debugging notebook.
Tail -f the file tail -f /var/log/krb5kdc.log on the ipa server.
Start by doing a kdestroy on my home machine, and then
kinit ayoung@OPENSTACK.FREEIPA.ORG
I see this in the IPA server.
Apr 25 22:38:56 ipa.openstack.freeipa.org krb5kdc[5728](info): AS_REQ (7 etypes {18 17 16 23 1 3 2}) 10.10.59.141: NEEDED_PREAUTH: ayoung@OPENSTACK.FREEIPA.ORG for krbtgt/OPENSTACK.FREEIPA.ORG@OPENSTACK.FREEIPA.ORG, Additional pre-authentication required
Apr 25 22:39:00 ipa.openstack.freeipa.org krb5kdc[5728](info): AS_REQ (7 etypes {18 17 16 23 1 3 2}) 10.10.59.141: ISSUE: authtime 1366929540, etypes {rep=18 tkt=18 ses=18}, ayoung@OPENSTACK.FREEIPA.ORG for krbtgt/OPENSTACK.FREEIPA.ORG@OPENSTACK.FREEIPA.ORG
Apr 25 22:39:01 ipa.openstack.freeipa.org krb5kdc[5729](info): AS_REQ (6 etypes {18 17 16 23 25 26}) 192.168.0.61: NEEDED_PREAUTH: keystone@OPENSTACK.FREEIPA.ORG for krbtgt/OPENSTACK.FREEIPA.ORG@OPENSTACK.FREEIPA.ORG, Additional pre-authentication required
Apr 25 22:39:01 ipa.openstack.freeipa.org krb5kdc[5729](info): AS_REQ (6 etypes {18 17 16 23 25 26}) 192.168.0.61: ISSUE: authtime 1366929541, etypes {rep=18 tkt=18 ses=18}, keystone@OPENSTACK.FREEIPA.ORG for krbtgt/OPENSTACK.FREEIPA.ORG@OPENSTACK.FREEIPA.ORG
Now try to hit the web UI with my browser by pointing it at:
https://ipa.openstack.freeipa.org/ipa/ui/
Klist shows no ticket…I probably need to log out first to forget the form based auth. Click log out and see a page that says:
You have been logged out
Return to main page.
Returning to the main page should do a negotiate. Lets see… nope
OK, just to be sure, I go through the browser config steps again. Then head back to the main page: and it works. Looking in the log, the interesting entries are:
Apr 25 22:44:44 ipa.openstack.freeipa.org krb5kdc[5728](info): TGS_REQ (7 etypes {18 17 16 23 1 3 2}) 10.10.59.141: ISSUE: authtime 1366929540, etypes {rep=18 tkt=18 ses=18}, ayoung@OPENSTACK.FREEIPA.ORG for HTTP/ipa.openstack.freeipa.org@OPENSTACK.FREEIPA.ORG
This shows it getting a ticket for the web UI and then klist shows
Valid starting Expires Service principal 04/25/13 18:39:00 04/26/13 18:39:00 krbtgt/OPENSTACK.FREEIPA.ORG@OPENSTACK.FREEIPA.ORG renew until 04/26/13 18:42:53 04/25/13 18:44:44 04/26/13 18:39:00 HTTP/ipa.openstack.freeipa.org@ renew until 04/26/13 18:42:53 04/25/13 18:44:44 04/26/13 18:39:00 HTTP/ipa.openstack.freeipa.org@OPENSTACK.FREEIPA.ORG renew until 04/26/13 18:42:53
OK, on to those failing machines.
ssh -vv pg.openstack.freeipa.org debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug1: Next authentication method: gssapi-keyex debug1: No valid Key exchange context debug2: we did not send a packet, disable method debug1: Next authentication method: gssapi-with-mic debug2: we sent a gssapi-with-mic packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug2: we sent a gssapi-with-mic packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug2: we sent a gssapi-with-mic packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic debug2: we sent a gssapi-with-mic packet, wait for reply debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic ... Received disconnect from 10.16.16.125: 2: Too many authentication failures for ayoung
Nothing in the krb5kdc.log for that transaction, but I see that I now have a ticket for pg…must have gotten it from a prior attempt. Kdestroy, kinit and try again.
See this
Apr 25 22:50:43 ipa.openstack.freeipa.org krb5kdc[5728](info): TGS_REQ (7 etypes {18 17 16 23 1 3 2}) 10.10.59.141: ISSUE: authtime 1366930206, etypes {rep=18 tkt=18 ses=18}, ayoung@OPENSTACK.FREEIPA.ORG for host/pg.openstack.freeipa.org@OPENSTACK.FREEIPA.ORG
OK, I have a Host ticket. Same response from the server. I can connect to the pg server via an ssh keypair, so I have a backdoor to debug. ssh in as root and: let me see if there is an sshd log.
Apr 25 22:58:30 pg sshd[6115]: Invalid user ayoung from 10.10.59.141 Apr 25 22:58:30 pg sshd[6115]: input_userauth_request: invalid user ayoung [preauth] Apr 25 22:58:30 pg sshd[6115]: Disconnecting: Too many authentication failures for ayoung [preauth]
Hmm. Invalid user. Sounds like a getent failure of some sort.
Is sssd running?
systemctl status sssd.service ... Active: active (running) since Mon 2013-04-22 14:25:39 UTC; 3 days ago
Yep. OK, what about nsswitch setup?
passwd: files sss That looks right. Should check in /etc/passwrd and then talk to sss, which should talk to IPA. Lets see if that is the case....nothing in /var/log/sssd/sssd_ssh.log /var/log/sssd/sssd.log /var/log/sssd/sssd_nss.log
How about /var/log/secure? Same as the sshd log.
ping ipa ping: unknown host ipa\
AHA! Rebooting did a new dhcp request and probably overwrote my /etc/resolve.conf file….lets look:
[root@pg ~]# cat /etc/resolv.conf # Generated by NetworkManager domain novalocal search novalocal nameserver 192.168.0.3
My internal was 192.168.0.45 for IPA….OK, we have at least one culprit. Change it to:
[root@pg ~]# cat /etc/resolv.conf # Generated by NetworkManager domain openstack.freeipa.org search openstack.freeipa.org domain novalocal nameserver 192.168.0.45
And now
[root@pg ~]# getent passwd ayoung ayoung:*:1615800005:1615800005:Adam Young:/home/ayoung:/bin/sh
So…here is the fix: add the following to /etc/dhcp/dhclient.conf
interface "eth0" {
supersede domain-name "openstack.freeipa.org";
supersede domain-search "openstack.freeipa.org";
supersede domain-name-servers 192.168.0.45;
}
And the resolv.conf data survives a reboot.
firewall-d for FreeIPA
First hack at a script to open the ports needed by FreeIPA. On Fedora 18, running Firewall D, I ran the below script. Comments and corrections welcome.