Github user ustcweizhou commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1916#discussion_r97645697
  
    --- Diff: debian/cloudstack-management.postinst ---
    @@ -60,7 +60,26 @@ if [ "$1" = configure ]; then
     
         chmod 0640 ${CONFDIR}/${DBPROPS}
         chgrp cloud ${CONFDIR}/${DBPROPS}
    -    invoke-rc.d tomcat6 stop || true
    +
    +    if [ -d "/usr/share/tomcat7" ]; then
    +        rm -f /usr/share/cloudstack-management/bin
    +        rm -f /usr/share/cloudstack-management/lib
    +        ln -s /usr/share/tomcat7/bin /usr/share/cloudstack-management/bin
    +        ln -s /usr/share/tomcat7/lib /usr/share/cloudstack-management/lib
    +        invoke-rc.d tomcat7 stop || true
    +        if [ ! -f "/etc/cloudstack/management/server.xml" ]; then
    +            ln -s /etc/cloudstack/management/server7-nonssl.xml 
/etc/cloudstack/management/server.xml
    +        fi
    +    elif [ -d "/usr/share/tomcat6" ]; then
    +        rm -f /usr/share/cloudstack-management/bin
    +        rm -f /usr/share/cloudstack-management/lib
    +        ln -s /usr/share/tomcat6/bin /usr/share/cloudstack-management/bin
    +        ln -s /usr/share/tomcat6/lib /usr/share/cloudstack-management/lib
    +        invoke-rc.d tomcat6 stop || true
    +        if [ ! -f "/etc/cloudstack/management/server.xml" ]; then
    +            ln -s /etc/cloudstack/management/server-nonssl.xml 
/etc/cloudstack/management/server.xml
    +        fi
    +    fi
    --- End diff --
    
    @wido I was thinking of other ways but could not find. Do you have any idea?
    We can remove this change and ask users to execute 
"cloudstack-setup-management --tomcat7" after each upgrade. It seems not wise.
    
    I have tested the upgrade from 4.7.1 to 4.9.3.0-SNAPSHOT on ubuntu 12.04 
and 16.04 without any issue.
    I did not test the os upgrade or tomcat upgrade.


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