Hi
You can see from the snippet of your log here, that both Alfresco and Share applications are failing to start. You need to look into the alfresco.log and share.log files (or in tomcat/logs/catalina.out) to see the root cause oft the particular errors that are causing the applications to fail to start
<blockquote>
May 13, 2016 10:28:10 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor /opt/alfresco-community/tomcat/conf/Catalina/localhost/share.xml
May 13, 2016 10:28:14 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
May 13, 2016 10:28:14 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/share] startup failed due to previous errors
May 13, 2016 10:28:14 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deployment of configuration descriptor /opt/alfresco-community/tomcat/conf/Catalina/localhost/share.xml has finished in 3,785 ms
May 13, 2016 10:28:14 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor /opt/alfresco-community/tomcat/conf/Catalina/localhost/alfresco.xml
May 13, 2016 10:28:44 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
</blockquote>
Regards
Steven