Troubleshoot the Identity service¶

Debug PKI middleware¶

If you receive an Invalid OpenStack Identity Credentials message when you talk to an OpenStack service, it might be caused by the changeover from UUID tokens to PKI tokens in the Grizzly release. Learn how to troubleshoot this error.

The PKI-based token validation scheme relies on certificates from Identity that are fetched through HTTP and stored in a local directory. The location for this directory is specified by the signing_dir configuration option. In your services configuration file, look for a section like this:

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 [keystone_authtoken]
 signing_dir = /var/cache/glance/api
 auth_uri = http://controller:5000/v2.0
 identity_uri = http://controller:35357
 admin_tenant_name = service
 admin_user = glance

The first thing to check is that the signing_dir does, in fact, exist. If it does, check for certificate files:

$ ls -la /var/cache/glance/api/

total 24
drwx------. 2 ayoung root 4096 Jul 22 10:58 .
drwxr-xr-x. 4 root root 4096 Nov 7 2012 ..
-rw-r-----. 1 ayoung ayoung 1424 Jul 22 10:58 cacert.pem
-rw-r-----. 1 ayoung ayoung 15 Jul 22 10:58 revoked.pem
-rw-r-----. 1 ayoung ayoung 4518 Jul 22 10:58 signing_cert.pem

This directory contains two certificates and the token revocation list. If these files are not present, your service cannot fetch them from Identity. To troubleshoot, try to talk to Identity to make sure it correctly serves files, as follows:

$ curl http://localhost:35357/v2.0/certificates/signing

This command fetches the signing certificate:

Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number: 1 (0x1)
    Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=US, ST=Unset, L=Unset, O=Unset, CN=www.example.com
        Validity
            Not Before: Jul 22 14:57:31 2013 GMT
            Not After : Jul 20 14:57:31 2023 GMT
        Subject: C=US, ST=Unset, O=Unset, CN=www.example.com

Note the expiration dates of the certificate:

Not Before: Jul 22 14:57:31 2013 GMT
Not After : Jul 20 14:57:31 2023 GMT

The token revocation list is updated once a minute, but the certificates are not. One possible problem is that the certificates are the wrong files or garbage. You can remove these files and run another command against your server; they are fetched on demand.

The Identity service log should show the access of the certificate files. You might have to turn up your logging levels. Set debug = True and verbose = True in your Identity configuration file and restart the Identity server.

(keystone.common.wsgi): 2013-07-24 12:18:11,461 DEBUG wsgi __call__
arg_dict: {}
(access): 2013-07-24 12:18:11,462 INFO core __call__ 127.0.0.1 - - [24/Jul/2013:16:18:11 +0000]
"GET http://localhost:35357/v2.0/certificates/signing HTTP/1.0" 200 4518

If the files do not appear in your directory after this, it is likely one of the following issues:

• Your service is configured incorrectly and cannot talk to Identity. Check the auth_port and auth_host values and make sure that you can talk to that service through cURL, as shown previously.
• Your signing directory is not writable. Use the chmod command to change its permissions so that the service (POSIX) user can write to it. Verify the change through su and touch commands.
• The SELinux policy is denying access to the directory.

SELinux troubles often occur when you use Fedora or RHEL-based packages and you choose configuration options that do not match the standard policy. Run the setenforce permissive command. If that makes a difference, you should relabel the directory. If you are using a sub-directory of the /var/cache/ directory, run the following command:

# restorecon /var/cache/

If you are not using a /var/cache sub-directory, you should. Modify the signing_dir configuration option for your service and restart.

Set back to setenforce enforcing to confirm that your changes solve the problem.

If your certificates are fetched on demand, the PKI validation is working properly. Most likely, the token from Identity is not valid for the operation you are attempting to perform, and your user needs a different role for the operation.

Debug signing key file errors¶

If an error occurs when the signing key file opens, it is possible that the person who ran the keystone-manage pki_setup command to generate certificates and keys did not use the correct user. When you run the keystone-manage pki_setup command, Identity generates a set of certificates and keys in /etc/keystone/ssl*, which is owned by root:root.

This can present a problem when you run the Identity daemon under the keystone user account (nologin) when you try to run PKI. Unless you run the chown command against the files keystone:keystone, or run the keystone-manage pki_setup command with the --keystone-user and --keystone-group` parameters, you will get an error. For example:

2012-07-31 11:10:53 ERROR [keystone.common.cms] Error opening signing key file
/etc/keystone/ssl/private/signing_key.pem
140380567730016:error:0200100D:system library:fopen:Permission
denied:bss_file.c:398:fopen('/etc/keystone/ssl/private/signing_key.pem','r')
140380567730016:error:20074002:BIO routines:FILE_CTRL:system lib:bss_file.c:400:
unable to load signing key file

Flush expired tokens from the token database table¶

As you generate tokens, the token database table on the Identity server grows. To clear the token table, an administrative user must run the keystone-manage token_flush command to flush the tokens. When you flush tokens, expired tokens are deleted and traceability is eliminated.

Use cron to schedule this command to run frequently based on your workload. For large workloads, running it every minute is recommended.