Upgrade CentOS

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Latest revision as of 12:20, 17 April 2020

Benefits

Obtain the CentOS security updates
Patch recent vulnerabilities
Patch SNMP core files

Applicable Products

TMG800, TMG3200, TMG7800-CTRL, TSBC, FreeSBC
TSG800, TSG3200
Tdev Linux server (CentOS or RedHat) running Toolpack software

TelcoBridges repository

The operating system (CentOS) software upgrade is performed using yum software package manager. The repositories sites providing RPM packages are configured from /etc/yum.repos.d/. TelcoBridges provides a modified CentOS repository copy (http://repo.telcobridges.com) of the official CentOS repository.

If the unit or Linux server does not have access to Internet (or does not have DNS configured), you should configure an offline CentOS repository on your local machine as explained in the section bellow.

Offline repository configuration

First, SSH to your unit do determine which version of the OS your system is using:

# cat /etc/redhat-release

CentOS release 5.11 (Final)

Configure a local offline Repository for CentOS5

CentOS Linux release 7(Core)

Configure a local offline Repository for CentOS7

CentOS software packages update

The operator can use one of the two methods available: GUI/WebPortal or command line interface.

WebPortal

NOTE: The GUI/WebPortal CentOS packages software upgrade shown below is only offered on Tsbc, Tmedia and Tsig product. Tdev Linux server with Toolpack must be upgraded using the Command Line procedure.

To upgrade CentOS software packages, follow this procedure from the web interface of the unit:

Hosts -> Status -> TBxxxxxx -> Action -> Upgrade Linux Packages, then 'Apply Action':

When the upgrade is in progress, there is no status shown, and you will see the screen like this:

It may take a while 8-10 mins. You need to refresh the page until you see this:

Once complete, you need to reboot the host: Hosts -> Status -> TBxxxxxx -> Action -> Shutdown -> Reboot

Command line

Alternatively, you can ssh to the unit and run the following command:

# yum clean all
# yum update

Reboot the unit

# reboot

@@ Line 1: / Line 1: @@
-{{DISPLAYTITLE: Upgrade CentOS to have the latest patches}}
+{{DISPLAYTITLE: Upgrade CentOS software packages}}
+__FORCETOC__
-= benefit to have the latest patches =
+== Benefits ==
+* Obtain the CentOS security updates
 * Patch recent vulnerabilities
 * Patch SNMP core files
-= Applicable Products  =
+== Applicable Products ==
-* TMG800, TMG3200, TMG7800-CTRL
+* TMG800, TMG3200, TMG7800-CTRL, TSBC, FreeSBC
-* Tdev Linux server with (CentOS, RedHat, etc) running Toolpack software
+* TSG800, TSG3200
+* Tdev Linux server (CentOS or RedHat) running Toolpack software
-= Details =
+== TelcoBridges repository ==
-The impact of this vulnerability on TelcoBridges products depends on their configuration. The vulnerability may only be triggered through requests for domain name resolution. Therefore, only units that enable such services may be exposed to the issue.
+The operating system (CentOS) software upgrade is performed using ''yum'' software package manager. The repositories sites providing RPM packages are configured from /etc/yum.repos.d/. TelcoBridges provides a modified CentOS repository copy (http://repo.telcobridges.com) of the official CentOS repository.
-= Software Versions and Fixes =
+If the '''unit or Linux server does not have access to Internet''' (or does not have DNS configured), you should configure an offline CentOS repository on your local machine as explained in the section bellow.
-The TelcoBridges CentOS 5 repository has been updated with the latest glibc version. Services that use glibc must be restarted. Because glibc is thoroughly used in the Linux operating system, it is highly recommended to reboot the unit.
-= Update procedure =
+=== Offline repository configuration ===
-The operator can use one of the two methods available: GUI/WebPortal or command line interface.
+First, SSH to your unit do determine which version of the OS your system is using:
+ # cat /etc/redhat-release
+'''CentOS release 5'''.11 (Final)
-== WebPortal - TMG unit or Linux server '''with access to Internet''' (i.e. with DNS configured) ==
+* [[Configure_Offline_Repository_CentOS5_A|Configure a local offline Repository for CentOS5]]
-* login onto the WebPortal
-* Select the 'Hosts' section
-* Click on the hostname
-* Click on the 'Status' tab
-* Select 'Upgrade Linux packages' into the host 'Action'
-* Click on the 'Apply action' button
-* Refresh the page until the packages are updated as indicated in the 'Action Log' (you may use the 'Now' button to update the page). The results should appear within a minute.
-* Select 'Shutdown' into the host 'Action'
-* Select 'Reboot' into the 'Shutdown Type'
-* Click on the 'Apply action' button
-* Repeat the process for all hosts listed
-== Command line interface ==
+'''CentOS Linux release 7'''(Core)
+* [[Configure_Offline_Repository_CentOS7_A|Configure a local offline Repository for CentOS7]]
-* login with root account
- [root@TB011107 ~]# uname -m
- x86_64
-* If the result is not "x86_64", [[Support:Contacting TelcoBridges technical support|please contact TelcoBridges]] support, otherwise you can proceed with either method below.
-* Follow one of the two options depending if Internet is accessible from the unit
-=== Option #1 - TMG unit or Linux server '''with access to Internet''' (i.e. with DNS configured) ===
+== CentOS software packages update ==
+The operator can use one of the two methods available: GUI/WebPortal or command line interface.
+=== WebPortal ===
+<span style="color:#e68a00">
+'''NOTE''': The GUI/WebPortal CentOS packages software upgrade shown below is only offered on ''T''sbc, ''T''media and ''T''sig product. Tdev Linux server with Toolpack must be upgraded using the Command Line procedure.
+</span>
-* update OS packages with yum
+To upgrade CentOS software packages, follow this procedure from the web interface of the unit:
- yum clean all
+* Hosts -> Status -> TBxxxxxx -> Action -> Upgrade Linux Packages, then 'Apply Action':
- yum update
+[[Image:Upgrade_Linux_Packages.jpg]]
-* reboot the unit
- reboot
-=== Option #2 - TMG unit or Linux server '''without access to Internet''' ===
+When the upgrade is in progress, there is no status shown, and you will see the screen like this:
-* download the following packages to your PC:
-** http://repo.telcobridges.com/centos/5.7/updates/x86_64/RPMS/glibc-2.5-123.el5_11.1.x86_64.rpm
-** http://repo.telcobridges.com/centos/5.7/updates/x86_64/RPMS/glibc-common-2.5-123.el5_11.1.x86_64.rpm
-** http://repo.telcobridges.com/centos/5.7/updates/x86_64/RPMS/glibc-devel-2.5-123.el5_11.1.x86_64.rpm
-** http://repo.telcobridges.com/centos/5.7/updates/x86_64/RPMS/glibc-headers-2.5-123.el5_11.1.x86_64.rpm
-** http://repo.telcobridges.com/centos/5.7/updates/x86_64/RPMS/nscd-2.5-123.el5_11.1.x86_64.rpm
-* Using WinSCP or similar tool, upload the files to the TMG unit using the root account
-* login with root account
-* Install packages
- yum localinstall glibc-2.5-123.el5_11.1.x86_64.rpm \
-   glibc-common-2.5-123.el5_11.1.x86_64.rpm \
-   glibc-devel-2.5-123.el5_11.1.x86_64.rpm \
-   glibc-headers-2.5-123.el5_11.1.x86_64.rpm \
-   nscd-2.5-123.el5_11.1.x86_64.rpm
-* '''Note''': that operation might take a long time since yum will probably experience timeouts when trying to access the external repositories.
-* Reboot the unit
- reboot
-= How to verify if the vulnerability is fixed? =
+[[Image:Upgrade_Linux_Progress.jpg]]
-* login with root account
-* execute the following to create a test script
- cat > rhel-GHOST-test.sh << FOF
- #!/bin/bash
- # rhel-GHOST-test.sh -  GHOST vulnerability tester. Only for CentOS/RHEL based servers.  #
- # Version 3
- # Credit : Red Hat, Inc - https://access.redhat.com/labs/ghost/ #
- echo "Installed glibc version(s)"
- rv=0
- for glibc_nvr in \$( rpm -q --qf '%{name}-%{version}-%{release}.%{arch}\n' glibc ); do
-     glibc_ver=\$( echo "\$glibc_nvr" | awk -F- '{ print \$2 }' )
-     glibc_maj=\$( echo "\$glibc_ver" | awk -F. '{ print \$1 }')
-     glibc_min=\$( echo "\$glibc_ver" | awk -F. '{ print \$2 }')
-     echo -n "- \$glibc_nvr: "
-     if [ "\$glibc_maj" -gt 2 -o \( "\$glibc_maj" -eq 2  -a  "\$glibc_min" -ge 18 \) ]; then
-         # fixed upstream version
-         echo 'not vulnerable'
-     else
-         # all RHEL updates include CVE in rpm %changelog
-         if rpm -q --changelog "\$glibc_nvr" | grep -q 'CVE-2015-0235'; then
-             echo "not vulnerable"
-         else
-             echo "vulnerable"
-             rv=1
-         fi
-     fi
- done
- if [ \$rv -ne 0 ]; then
-     cat <<EOF
- This system is vulnerable to CVE-2015-0235. <https://access.redhat.com/security/cve/CVE-2015-0235>
- Please refer to <https://access.redhat.com/articles/1332213> for remediation steps
- EOF
- fi
- exit \$rv
- FOF
-* Execute the script
- chmod +x rhel-GHOST-test.sh
- ./rhel-GHOST-test.sh
-* '''You should not see the 'vulnerable' string displayed'''
+It may take a while 8-10 mins. You need to refresh the page until you see this:
-= Verify system timezone =
+[[Image:Centos_Upgrade_Complete.jpg]]
-We found that some systems got the timezone reset to EST time after the GHOST patch procedures
-* Verify the timezone on the system
- date
-If it differs from the original, reset the timezone using the [[TMG:Change_Time_Zone|tbtimezone]] script.
+Once complete, you need to reboot the host:
+Hosts -> Status -> TBxxxxxx -> Action -> Shutdown -> Reboot
+=== Command line ===
+Alternatively, you can ssh to the unit and run the following command:
+ # yum clean all
+ # yum update
-= References =
+Reboot the unit
-* https://www.qualys.com/research/security-advisories/GHOST-CVE-2015-0235.txt
+ # reboot
-* https://access.redhat.com/articles/1332213
-* http://www.cyberciti.biz/faq/cve-2015-0235-patch-ghost-on-debian-ubuntu-fedora-centos-rhel-linux/

Upgrade CentOS

Latest revision as of 12:20, 17 April 2020

Contents

Benefits

Applicable Products

TelcoBridges repository

Offline repository configuration

CentOS software packages update

WebPortal

Command line

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