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Issue #16 February 2006
Red Hat's customer service team receives technical support questions from users all over the world. As they are received, Red Hat technicians add the questions and answers to the Red Hat Knowledgebase on a daily basis. Individuals with a redhat.com login are granted access. Every month, Red Hat Magazine offers a preview into the Red Hat Knowledgebase by highlighting some of the most recent entries.
It's no secret that system administrators often like to remote control a user's Red Hat Enterprise Linux desktop without the mess of configuring VNC. With Red Hat Enterprise Linux 4, this is now possible. Red Hat Enterprise Linux 4 provides the GNOME desktop with a vnc like service called vino. It will allow a VNC client to remotely control the logged in users native GNOME desktop and enable desktop sharing.
To activate the target user's desktop, do the following:
Voila! It's that easy. A remote VNC client can then access the current users GNOME desktop by pointing it to display :0 on the machine.
Release: Red Hat Network Satellite 4.0
Background
Red Hat Network (RHN) Satellite supports Solaris Technology as part of the RHN Satellite 4.0 release. One possible reason why patches fail to install is because of a bug within the solaris2mpm command that was released with Satellite 4.0.0 and 4.0.1 under the right conditions, generated incorrect data to be associated with the patch.
If the system runs the Solaris client command with verbose output, such as rhn_check -vvv, this output should be seen:
Computing transaction...
D: Sending back response (102, "Patch install failed: Can't install
patch-solaris-112805-01-1: no package provides patch-solaris- >= 01",
{'version': 0, 'name': 'solarispkgs.patchInstall'})
The key part to this error message is "patch-solaris-". The solaris2mpm command is part of the rhnpush package. If the patch mpms were created using rhnpush < rhnpush-4.0.5-62.rhel3 or rhnpush < rhnpush-4.0.5-63.rhel4, the mpms could possibly contain this incorrect "patch-solaris-" dependency information.
Resolution
This is a two part resolution. The first is to run a small SQL script on the Satellite server database to remove this information. The second is to delete any channel cache files from the Satellite that may have been generated that also contain this data.
NOTES:
Have the database administrator (DBA) perform these tasks if the RHN Satellite is an external Oracle database
If the system is running an embedded database, then follow these commands exactly:
Determine how many packages are current affected by this issue in the database, create a text file with name check.sql and contents:
select count(*) as "Total bad entries" from rhnpackagerequires where capability_id in ( select id from rhnpackagecapability where name='patch-solaris-');
Run this SQL query as root on the RHN Satellite server with command /opt/oracle/bin/sqlplus rhnsat/rhnsat@rhnsat @check.sql.
If needed, delete the incorrect data from the database. To do this, create another text file with name delete.sql and contents:
delete from rhnpackagerequires where capability_id in ( select id from rhnpackagecapability where name='patch-solaris-'); commit; quit;
Run this SQL query as root on the RHN Satellite server with command /opt/oracle/bin/sqlplus rhnsat/rhnsat@rhnsat @delete.sql.
Re-run the first command to confirm that all incorrect data has been removed.
Now, delete the RHN Satellite channel cache files. These files will be automatically regenerated as soon as a client system requests the data. These files are created to match the Channel associated with them; example files are:
/var/cache/rhn/list_all_packages_complete-solaris-8 /var/cache/rhn/list_all_packages_complete-solaris-9
Use the ls and rm command to list and delete the appropriate files from the /var/cache/rhn/ directory.
A self-signed certificate is a certificate that is digitally signed by the same entity. For example, the Root CA that the certificate identifies.
In order to identify them, look in the details of the self-signed certificate. The Issuer or Issuer Distinguished Name (DN) and Subject Distinguished Name (DN) will be the same. For example:
Issuer: CN=Certificate Manager,O=TestOrg,C=US Subject: CN=Certificate Manager,O=TestOrg,C=US
Note: Netscape Certificate Management System (CMS) is now called Red Hat Certificate System.
To determine if a system is nearing the memory threshold, enable the SystemInfoServlet functionality. Enable this on the End Entity (EE) interface and use wget or some similar tool to poll the stats of the server to see how memory usage is growing as the Certificate Revocation List (CRL) is being built.
Edit the <server-root>/cert-xxx/web-apps/ee/WEB-INF/web.xml file. At the top of the file, register the servlet. Add this immediately after the web-app line.
<servlet>
<servlet-name> sysinfo </servlet-name>
<servlet-class>
com.netscape.cms.servlet.base.SystemInfoServlet</servlet-class>
<init-param><param-name> GetClientCert </param-name>
<param-value> false </param-value> </init-param>
<init-param><param-name> ACLinfo </param-name>
<param-value> certServer.ca.sysinfo:read:allow (read)
user="anybody":anybody </param-value> </init-param>
<init-param><param-name> AuthzMgr </param-name>
<param-value> BasicAclAuthz </param-value> </init-param>
</servlet>
At the bottom of the file, add a servlet mapping:
<servlet-mapping>
<servlet-name> sysinfo </servlet-name>
<url-pattern> /sysinfo </url-pattern>
</servlet-mapping>
Once the CA instance is restarted, visit the URL http://{YourEndEntityPage}/sysinfo to view useful stats. For example:
Server Started Time: Thu Apr 28 15:00:25 PDT 2005 Current Time: Thu Apr 28 15:01:38 PDT 2005 Available Processors: 1 Active Threads: 25 Max Memory (in Bytes): 512000000 Total Memory (in Bytes): 12384768 Free Memory (in Bytes): 6399864 Free Memory / Total Memory: 51%
Max, Total, and Free memory values are determined by the calls to Runtime.getRuntime(), {maxMemory(), totalMemory(), and freeMemory()} respectively. The API's and definitions for some of these functions can be found at http://java.sun.com/j2se/1.3/docs/api/java/lang/Runtime.html.
Note: Netscape Certificate Management System (CMS) is now called Red Hat Certificate System.
The original article can be found at the Newsgroup: netscape.public.mozilla.crypto
This tech note explains how to add a builtin root CA certificate to Network Security Services (NSS). The builtin root CA certificates in NSS are stored in the nssckbi PKCS #11 module. The sources to the nssckbi module are in the mozilla/security/nss/lib/ckfw/builtins directory. Use the addbuiltin command-line tool to add a root CA certificate to the nssckbi module. In the procedure described below, it is assumed that the new root CA certificate is distributed in DER format in the file newroot.der.
% gmake generate % cd mozilla/security/nss/lib/ckfw/builtins % addbuiltin -n "Name of the Root Certificate" -t C,C,C < newroot.der >> certdata.txt % gmake generate
Note: Netscape Certificate Management System (CMS) is now called Red Hat Certificate System.
Some third party applications require 32 bit versions of libraries to be installed when running on 64 bit system.
To install the latest version of the 32 bit package and automatically resolve dependencies, use the command:
up2date -u [package-name] --arch=i386
For example:
up2date -u xorg-x11-deprecated-libs --arch=i386
This would install the xorg-x11-deprecated-libs and associated 32 bit dependencies.
Some applications require 32 bit versions of libraries to be installed when running on 64 bit machines. These packages can usually be installed at the same time.
The architecture of an installed package can be shown with the command:
rpm -q --queryformat="%{n}-%{v}-%{r}.%{arch}\n" packagename
This would query the package "packagename" for its name, version, revision and architecture.
Below is the example for glibc on a 64 bit x86 system:
# rpm -q --queryformat="%{n}-%{v}-%{r}.%{arch}\n" glibc
glibc-2.3.2-95.20.x86_64
glibc-2.3.2-95.20.i686
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This article is protected by the Open Publication License, V1.0 or later. Copyright © 2004 by Red Hat, Inc.