View source for Zimbra Releases/8.8.11/nginx hotfix

=Proxy/Nginx Hotfix=

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This hotfix resolves critical Proxy/nginx bug where Proxy does not failover correctly in certain conditions. Please check '''[[#description|Issue Description]]''' section for more information.
Also check '''[[#installation|Hotfix Installation]]''' section for Hotfix Installation instructions.

=Issue Description=
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'''<font color='blue'>Proxy: Fixed issue where Proxies do not failover to the next mailbox server if the server is hung</font>'''<br>This issue is affecting Zimbra servers having zimbra-nginx version 1.7.1-1zimbra8.7b9. In multiple node environment, proxy workers are getting stuck in a loop due to failure to connect to the lookup handler of hung mailbox. This causes proxy to hang and it will not fallback to next working mailbox server. After upgrading to zimbra-nginx version <b>1.7.1-1zimbra8.7b11</b> this issue will be resolved.
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=Hotfix Installation=
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==Before Installing the Hotfix==
Before installing the Hotfix, consider the following:
* A full backup should be performed before Hotfix is applied. There is no automated roll-back.
* '''Important Note for ZCS Setup with Local ZCS repository:''' Customers who have setup local ZCS repository should first update the local repository by following instructions in [https://wiki.zimbra.com/wiki/Zimbra_Collaboration_repository#Keep_the_local_Repository_up_to_date wiki]

==Install the Hotfix==
Note: The  Hotfix package should be installed '''only''' on '''proxy''' nodes running in your environment. 
 
Please refer below steps for Hotfix installation on Redhat and Ubuntu platforms:

===Redhat===

'''Install/Upgrade zimbra-nginx on Proxy node for FOSS and NETWORK'''
* As root. Type below command
 yum clean metadata
 yum check-update 
 yum install zimbra-nginx
* Restart proxy as zimbra user
 su - zimbra
 zmproxyctl restart

=== Ubuntu ===

'''Install/Upgrade zimbra-nginx on Proxy node for FOSS and NETWORK'''
* As root. Type below command
 apt-get update
 apt-get install zimbra-nginx
* Restart proxy as zimbra user
 su - zimbra
 zmproxyctl restart
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