1）問題一：
JVM 堆記憶體溢位，導致confluence訪問慢或程式直接跑死問題
檢視/opt/atlassian/confluence/logs/catalina.out日誌，報錯資訊為：
java.lang.OutOfMemoryError: Direct buffer memory

解決辦法：增大JVM記憶體，做法如下：
在bin/catalina.sh指令碼檔案裡新增下面一行內容，具體記憶體增加到多少，要根據自己伺服器的實際記憶體來考慮（比如我的機器是128G，這裡我調整到24G）
[[email protected] ~]# vim /opt/atlassian/confluence/bin/catalina.sh      
......
JAVA_OPTS='-Xms20480m -Xmx20480m -XX:PermSize=10240M -XX:MaxNewSize=10240m -XX:MaxPermSize=5120m'

[
 
[email protected] ~]# /etc/init.d/confluence restart
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2）問題二：
confluence正常啟動，8090埠也順利起來了，但是confluence訪問報錯404！
[[email protected] ~]# tail -f /opt/atlassian/confluence/logs/catalina.out
........
11-Jan-2018 09:10:46.527 SEVERE [http-nio-8090-exec-6] org.springframework.web.socket.sockjs.client.SockJsClient.doHandshake Initial SockJS "Info" request to server failed, 
url=ws://127.0.0.1:8091/synchrony/sockjs/v1org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://127.0.0.1:8091/synchrony/sockjs/v1/info": 
Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)
        at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:607)
        at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:572)
        at org.springframework.web.socket.sockjs.client.RestTemplateXhrTransport.executeInfoRequestInternal(RestTemplateXhrTransport.java:138)
        at org.springframework.web.socket.sockjs.client.AbstractXhrTransport.executeInfoRequest(AbstractXhrTransport.java:153)
        at org.springframework.web.socket.sockjs.client.SockJsClient.getServerInfo(SockJsClient.java:286)
        at org.springframework.web.socket.sockjs.client.SockJsClient.doHandshake(SockJsClient.java:254)
        at org.springframework.web.socket.sockjs.client.SockJsClient.doHandshake(SockJsClient.java:236)
        at com.atlassian.synchrony.proxy.websocket.WebSocketProxy.afterConnectionEstablished(WebSocketProxy.java:49)
        at org.springframework.web.socket.handler.PerConnectionWebSocketHandler.afterConnectionEstablished(PerConnectionWebSocketHandler.java:81)

特別注意：
confluence和jira的日誌不只是只在/opt/atlassian/confluence/logs和/opt/atlassian/jira/logs下面，有時只根據這裡面的日誌是看不到具體報錯的！
還需要去confluence和jira服務的家目錄/var/atlassian/application-data（預設就是這個路徑）下面檢視日誌，可以通過這裡面的日誌資訊進行排錯。
日誌分別為/var/atlassian/application-data/jira/log/atlassian-jira.log和/var/atlassian/application-data/confluence/logs/atlassian-confluence.log
以上報錯檢視confluence日誌如下
[
 
[email protected] ~]# tail -f /var/atlassian/application-data/confluence/logs/atlassian-confluence.log
......
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hostComponentProvider': Injection of autowired dependencies failed; nested exception is 
org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.atlassian.plugin.spring.SpringHostComponentProviderFactoryBean.setSpringHos
tComponentProviderConfig(com.atlassian.plugin.spring.SpringHostComponentProviderConfig); nested exception is org.springframework.beans.factory.BeanCreationException: Error cre
ating bean with name 'bundledPluginLoader' defined in class path resource [services/pluginServiceContext.xml]: Cannot resolve reference to bean 'osgiPluginFactory' while setting 
constructor argument with key [1]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'osgiPluginFactory' defined in class 
path resource [services/pluginServiceContext.xml]: Cannot resolve reference to bean 'osgiPersistentCache' while setting constructor argument; nested exception is org.springframework.
beans.factory.BeanCreationException: Error creating bean with name 'osgiPersistentCache': FactoryBean threw exception on object creation; nested exception is com.atlassian.plugin.osgi.
container.OsgiContainerException: Unable to clean the cache directory: /var/atlassian/application-data/confluence/plugins-osgi-cache/felix

通過上面的日誌錯誤資訊可知，是由於cache快取目錄的許可權不對造成的：
[
 
[email protected] ~]# ll -d /var/atlassian/application-data/confluence/plugins-osgi-cache
drwxr-xr-x 5 root root 4096 Nov  9 10:54 /var/atlassian/application-data/confluence/plugins-osgi-cache

plugins-osgi-cache目前許可權是root，confluence程式許可權是confluence，所以不能建立快取資料。將其許可權修改為confluence即可！
建議可以將/var/atlassian/application-data/confluence下的目錄許可權全部修改為confluence.confluence。
[[email protected] ~]# chown -R confluence.confluence /var/atlassian/application-data/confluence/plugins-osgi-cache
[[email protected] ~]# ll -d /var/atlassian/application-data/confluence/plugins-osgi-cache
drwxr-xr-x 5 confluence confluence 4096 Nov  9 10:54 /var/atlassian/application-data/confluence/plugins-osgi-cache

如上修改後，訪問confluence就正常了（可以不用重啟confluence）
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問題三：
confluence登陸後，上傳附件報錯：Could not upload the file to Confluence. The server may be unavailable

檢視日誌：
[[email protected] ~]# tail -f /var/atlassian/application-data/confluence/logs/atlassian-confluence.log
......
javax.servlet.jsp.jspException: java.lang.RuntimeException: Error creating temp file in folder: /var/atlassian/application-data/confluence/attachments/ver003/21/87/4587521/92/247/3997842/5144597
javax.servlet.error.exception: java.lang.RuntimeException: Error creating temp file in folder: /var/atlassian/application-data/confluence/attachments/ver003/21/87/4587521/92/247/3997842/5144597

由此可以看出，附件不能上傳的原因是由於許可權問題導致的，解決如下：
[[email protected] ~]# ll -d /var/atlassian/application-data/confluence/attachments/ver003/
drwxr-xr-x 11 root root 4096 Jan  9 09:14 /var/atlassian/application-data/confluence/attachments/ver003/
[[email protected] ~]# chown -R confluence.confluence /var/atlassian/application-data/confluence/attachments
[[email protected] ~]# ll -d /var/atlassian/application-data/confluence/attachments/ver003/
drwxr-xr-x 11 confluence confluence 4096 Jan  9 09:14 /var/atlassian/application-data/confluence/attachments/ver003