嘗試啟動cosbench，遭遇報錯：
[root]hopisdtmelabs14# cat driver-boot.log /tmp/cosbench/0.4.2/log
java.net.BindException: Address already in use (Bind failed)
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:387)
at java.net.ServerSocket.bind(ServerSocket.java:375)
at java.net.ServerSocket.<init>(ServerSocket.java:237)
at java.net.ServerSocket.<init>(ServerSocket.java:128)
at org.eclipse.osgi.framework.internal.core.ConsoleManager.startConsole(ConsoleManager.java:186)
at org.eclipse.osgi.framework.internal.core.ConsoleManager.startConsole(ConsoleManager.java:132)
at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:269)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:175)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
!SESSION 2020-06-03 06:04:23.609 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_181
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -console 18089!ENTRY org.eclipse.osgi 4 0 2020-06-03 06:04:24.132
!MESSAGE Bundle plugins/cosbench-castor not found.
看起來像是網絡端口18089已經被占用了，殺掉那些進程，問題解決。
如何找到占用18089端口的進程？舉例如下：
# netstat -tulpn | grep 18089 /tmp/cosbench/cos/conf
tcp6 0 0 :::18089 :::* LISTEN 4090/java
# ps aux | grep java /tmp/cosbench/cos/conf
root 4090 0.0 0.4 21453452 315076 ? Sl 10:39 0:18 java -Dcosbench.tomcat.config=conf/driver-tomcat-server.xml -server -cp main/org.eclipse.equinox.launcher_1.2.0.v20110502.jar org.eclipse.equinox.launcher.Main -configuration conf/.driver -console 18089
root 4822 0.3 0.3 20319980 262324 pts/0 Sl 21:13 0:07 java -Dcosbench.tomcat.config=conf/controller-tomcat-server.xml -server -cp main/org.eclipse.equinox.launcher_1.2.0.v20110502.jar org.eclipse.equinox.launcher.Main -configuration conf/.controller -console 19089
root 4965 0.0 0.0 112828 2316 pts/0 S+ 21:46 0:00 grep --color=auto java
可以看出來在上面的例子中，4090就是占用了18089端口的進程號了，通過ps aux 還能看到詳細的命令行參數。
但cosbench driver 還是啟動不了。
[root]hopisdtmelabs14# bash ./start-driver.sh /tmp/cosbench/cos
Launching osgi framwork ...
Successfully launched osgi framework!
Booting cosbench driver ...
which: no nc in (/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/tme/bin:/usr/local/tme/tme_portal/perf_web/bin)
No appropriate tool found to detect cosbench driver status.
看報錯，應該是nc（ncat）這個軟件沒有安裝。可是通過yum還沒法正常安裝。我通過下面的命令解決了這個問題：
# yum -y install wget
# wget https://nmap.org/dist/ncat-7.80-1.x86_64.rpm
# yum localinstall ncat-7.80-1.x86_64.rpm
# cd /usr/bin
# ln -s ncat nc
裝好了nc之后，還是有錯誤。
# bash ./start-driver.sh /tmp/cosbench/cos
Launching osgi framwork ...
Successfully launched osgi framework!
Booting cosbench driver ...
...........................................................
Starting cosbench-log_0.4.2 [ERROR]
...........................................................
Starting cosbench-tomcat_0.4.2 [ERROR]
...........................................................
Starting cosbench-config_0.4.2 [ERROR]
...........................................................
Starting cosbench-http_0.4.2 [ERROR]
我懷疑是我的java的版本過高，所以卸掉java 8， 安裝java 7。
# rpm -aq | grep -i jdk /tmp/cosbench/cos
java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
copy-jdk-configs-3.3-10.el7_5.noarch
java-1.8.0-openjdk-headless-1.8.0.181-3.b13.el7_5.x86_64
# rpm -e java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64
# rpm -e java-1.8.0-openjdk-headless-1.8.0.181-3.b13.el7_5.x86_64
# yum remove java
安裝java 7.
#yum install java-1.7.0-openjdk
結果遇到了報錯，說有兩個軟件包太舊了，達不到安裝的要求。
嘗試安裝更新，結果還是報錯，無法更新。
[Errno 14] HTTP/HTTPS Error 404
於是執行下面的命令，對yum進行修復。
#yum clean all
#rm -rf /var/cache/yum/*
之后java 7也成功安裝了。
但還是報錯：
# cat driver-boot.log /tmp/cosbench/cos/log
Listening on port 0.0.0.0/0.0.0.0:18089 ...
!SESSION 2020-06-03 10:12:59.683 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.7.0_261
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -console 18089!ENTRY org.eclipse.osgi 4 0 2020-06-03 10:13:00.367
!MESSAGE Bundle plugins/cosbench-castor not found.!ENTRY org.eclipse.osgi 4 0 2020-06-03 10:13:00.368
!MESSAGE Bundle plugins/cosbench-log4j not found.!ENTRY org.eclipse.osgi 4 0 2020-06-03 10:13:00.368
!MESSAGE Bundle plugins/cosbench-log@6:start not found.!ENTRY org.eclipse.osgi 4 0 2020-06-03 10:13:00.369
!MESSAGE Bundle plugins/cosbench-config@6:start not found.…
…
Github的cosbench的站點里的issue#383里的步驟（具體步驟描述在這篇文章），即刪掉cosbench-start.sh里的一行（如下），我也試過了，並沒有解決問題。
TOOL_PARAMS="-i 0" -----Delete this line
經過查詢，找到了這篇文章，推薦不要使用正式版的0.4.2，推薦試試0.4.2.c4, 於是下載了更早的一個版本0.4.2.c4。
問題解決了，終於成功啟動了cosbench driver。
# bash ./start-driver.sh /tmp/cosbench/0.4.2.c4
Launching osgi framwork ...
Successfully launched osgi framework!
Booting cosbench driver ...
.
Starting cosbench-log_0.4.2 [OK]
.
Starting cosbench-tomcat_0.4.2 [OK]
Starting cosbench-config_0.4.2 [OK]
Starting cosbench-http_0.4.2 [OK]
Starting cosbench-cdmi-util_0.4.2 [OK]
Starting cosbench-core_0.4.2 [OK]
Starting cosbench-core-web_0.4.2 [OK]
Starting cosbench-api_0.4.2 [OK]
Starting cosbench-mock_0.4.2 [OK]
Starting cosbench-ampli_0.4.2 [OK]
Starting cosbench-swift_0.4.2 [OK]
Starting cosbench-keystone_0.4.2 [OK]
Starting cosbench-httpauth_0.4.2 [OK]
Starting cosbench-s3_0.4.2 [OK]
Starting cosbench-librados_0.4.2 [OK]
Starting cosbench-scality_0.4.2 [OK]
Starting cosbench-cdmi-swift_0.4.2 [OK]
Starting cosbench-cdmi-base_0.4.2 [OK]
Starting cosbench-driver_0.4.2 [OK]
Starting cosbench-driver-web_0.4.2 [OK]
Successfully started cosbench driver!
Listening on port 0.0.0.0/0.0.0.0:18089 ...
Persistence bundle starting...
Persistence bundle started.
----------------------------------------------
!!! Service will listen on web port: 18088 !!!
----------------------------------------------
不知道為什么，在CentOS 7上運行0.4.2 明顯的有問題，卻還不被修復，結果還要去使用稍早的版本release candidate 4, 這個事兒弄的挺惡心的。
To the English readers:
I document the process and issues here in detail, hope other people hit on the same issue can see it, and save time.
參考資料
================
How to check if port is in use on Linux or Unix
https://www.cyberciti.biz/faq/unix-linux-check-if-port-is-in-use-command/
NETCAT THE MULTI-PURPOSE NETWORKING TOOL
https://landoflinux.com/linux_netcat_command.html
Uninstall JDK rpm to reinstall
https://unix.stackexchange.com/questions/110512/uninstall-jdk-rpm-to-reinstall
yum-errors
https://wiki.centos.org/yum-errors
CosBench on Red Hat Linux
http://www.vtechdiary.com/2018/09/cosbench-on-red-hat-linux.html
Can't start the system #380