Linux安裝Mycat

1MyCat安裝及啓動

MyCat：

MyCat的官方網站：

http://www.mycat.org.cn/

下載地址：

https://github.com/MyCATApache/Mycat-download

已經更換爲：

http://dl.mycat.io/1.6-RELEASE/

第一步：將Mycat-server-1.4-release-20151019230038-linux.tar.gz上傳至服務器

tar -xzvf Mycat-server-1.4-release-20151019230038-linux.tar.gz
mv mycat /usr/local

第二步：將壓縮包解壓縮。建議將mycat放到/usr/local/mycat目錄下。

./mycat start

中止：第三步：進入mycat目錄的bin目錄，啓動mycat

./mycat stop

Mycat的默認端口號爲：8066mycat 支持的命令{ console | start | stop | restart | status | dump }

 

下載新版本的啓動的時候會報錯：

STATUS | wrapper  | 2019/09/27 10:19:53 | --> Wrapper Started as Daemon
STATUS | wrapper  | 2019/09/27 10:19:53 | Launching a JVM...
ERROR  | wrapper  | 2019/09/27 10:19:53 | JVM exited while loading the application.
INFO   | jvm 1    | 2019/09/27 10:19:53 | Invalid maximum heap size: -Xmx4G
INFO   | jvm 1    | 2019/09/27 10:19:53 | The specified size exceeds the maximum representable size.
INFO   | jvm 1    | 2019/09/27 10:19:53 | Error: Could not create the Java Virtual Machine.
INFO   | jvm 1    | 2019/09/27 10:19:53 | Error: A fatal exception has occurred. Program will exit.
STATUS | wrapper  | 2019/09/27 10:19:57 | Launching a JVM...
ERROR  | wrapper  | 2019/09/27 10:19:57 | JVM exited while loading the application.
INFO   | jvm 2    | 2019/09/27 10:19:57 | Invalid maximum heap size: -Xmx4G
INFO   | jvm 2    | 2019/09/27 10:19:57 | The specified size exceeds the maximum representable size.
INFO   | jvm 2    | 2019/09/27 10:19:57 | Error: Could not create the Java Virtual Machine.
INFO   | jvm 2    | 2019/09/27 10:19:57 | Error: A fatal exception has occurred. Program will exit.
STATUS | wrapper  | 2019/09/27 10:20:02 | Launching a JVM...
ERROR  | wrapper  | 2019/09/27 10:20:02 | JVM exited while loading the application.
INFO   | jvm 3    | 2019/09/27 10:20:02 | Invalid maximum heap size: -Xmx4G
INFO   | jvm 3    | 2019/09/27 10:20:02 | The specified size exceeds the maximum representable size.
INFO   | jvm 3    | 2019/09/27 10:20:02 | Error: Could not create the Java Virtual Machine.
INFO   | jvm 3    | 2019/09/27 10:20:02 | Error: A fatal exception has occurred. Program will exit.
STATUS | wrapper  | 2019/09/27 10:20:06 | Launching a JVM...
ERROR  | wrapper  | 2019/09/27 10:20:06 | JVM exited while loading the application.
INFO   | jvm 4    | 2019/09/27 10:20:06 | Invalid maximum heap size: -Xmx4G
INFO   | jvm 4    | 2019/09/27 10:20:06 | The specified size exceeds the maximum representable size.
INFO   | jvm 4    | 2019/09/27 10:20:06 | Error: Could not create the Java Virtual Machine.
INFO   | jvm 4    | 2019/09/27 10:20:06 | Error: A fatal exception has occurred. Program will exit.
STATUS | wrapper  | 2019/09/27 10:20:10 | Launching a JVM...
ERROR  | wrapper  | 2019/09/27 10:20:10 | JVM exited while loading the application.
INFO   | jvm 5    | 2019/09/27 10:20:10 | Invalid maximum heap size: -Xmx4G
INFO   | jvm 5    | 2019/09/27 10:20:10 | The specified size exceeds the maximum representable size.
INFO   | jvm 5    | 2019/09/27 10:20:10 | Error: Could not create the Java Virtual Machine.
INFO   | jvm 5    | 2019/09/27 10:20:10 | Error: A fatal exception has occurred. Program will exit.
FATAL  | wrapper  | 2019/09/27 10:20:10 | There were 5 failed launches in a row, each lasting less than 300 seconds.  Giving up.
FATAL  | wrapper  | 2019/09/27 10:20:10 |   There may be a configuration problem: please check the logs.
STATUS | wrapper  | 2019/09/27 10:20:10 | <-- Wrapper Stopped

　　　　大體意思是jvm內存不夠，解決方法：

　　　　在mycat文件下conf中修改wrapper.conf文件

　　　　刪除一下兩行：在第36,37行（1.6的版本）　　　　

wrapper.java.additional.10=-Xmx4G
wrapper.java.additional.11=-Xms1G

　　　　而後再次啓動的時候，還會報錯：

　　　　

STATUS | wrapper  | 2019/09/29 23:24:33 | --> Wrapper Started as Daemon
STATUS | wrapper  | 2019/09/29 23:24:34 | Launching a JVM...
ERROR  | wrapper  | 2019/09/29 23:24:49 | JVM exited while loading the application.
INFO   | jvm 1    | 2019/09/29 23:24:49 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cluster-1: cluster-1: Temporary failure in name resolution
STATUS | wrapper  | 2019/09/29 23:24:53 | Launching a JVM...
ERROR  | wrapper  | 2019/09/29 23:25:08 | JVM exited while loading the application.
INFO   | jvm 2    | 2019/09/29 23:25:08 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cluster-1: cluster-1: Temporary failure in name resolution
STATUS | wrapper  | 2019/09/29 23:25:12 | Launching a JVM...
ERROR  | wrapper  | 2019/09/29 23:25:28 | JVM exited while loading the application.
INFO   | jvm 3    | 2019/09/29 23:25:28 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cluster-1: cluster-1: Temporary failure in name resolution
STATUS | wrapper  | 2019/09/29 23:25:32 | Launching a JVM...
ERROR  | wrapper  | 2019/09/29 23:25:47 | JVM exited while loading the application.
INFO   | jvm 4    | 2019/09/29 23:25:47 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cluster-1: cluster-1: Temporary failure in name resolution
STATUS | wrapper  | 2019/09/29 23:25:51 | Launching a JVM...
ERROR  | wrapper  | 2019/09/29 23:26:06 | JVM exited while loading the application.
INFO   | jvm 5    | 2019/09/29 23:26:06 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: cluster-1: cluster-1: Temporary failure in name resolution
FATAL  | wrapper  | 2019/09/29 23:26:06 | There were 5 failed launches in a row, each lasting less than 300 seconds.  Giving up.
FATAL  | wrapper  | 2019/09/29 23:26:06 |   There may be a configuration problem: please check the logs.
STATUS | wrapper  | 2019/09/29 23:26:06 | <-- Wrapper Stopped

　　　　解決方法：　

　　vi     /etc/sysconfig/network

    追加一行： HOSTNAME=你的主機名

    接着修改：  vi     /etc/hosts

    添加這句後面添加 你的主機名

    127.0.0.1               localhost.localdomain localhost 你的主機名

　　　　而後從新啓動。。。。ok