Manage services on ubuntu

To add/remove service in ubuntu. Manually you can put init script in /etc/init.d then create symbolic link from /etc/rc?.d/S[NN]name or K[NN]name to /etc/init.d/scriptname.[S for start and K for stop]
In ubuntu has a tool to manage init scripts call update-rc.d. For example if you want to start serviceA in runlevel 2 3 4 5 with sequence number 18 and stop in runlevel 0 1 6 with sequence number 99 use the command.[the scriptA must already create in /etc/init.d]

pnix@pnix-a7n:~$ sudo update-rc.d serviceA start 18 2 3 4 5 . stop 99 0 1 6

In redhat base linux, i use chkconfig do the same thing. For more detail try 'man chkconfig'.

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Too many open files

Last week tomcat log file report many error about "Too many open files" when it has high traffic. Some in catalina_log say 2007-04-07 16:13:40 HttpProcessor[80][272] Starting background thread 2007-04-07 16:13:40 HttpConnector[80] accept: java.net.SocketException: Too many open files and here is from localhost_log 2007-04-07 16:13:40 StandardWrapperValve[myservlet]: Servlet.service() for servlet myservlet threw exception java.io.FileNotFoundException: /home/log/mylog_070407.log (Too many open files) This is because too many file descriptors're opened by tomcat. File descriptor can be limited in both system level and shell level. To check maximum number of fd in system type 'cat /proc/sys/fs/file-max'. In my case it is 65536(someone said it should set to 200000). Tomcat error when try to open socket number 272 so I think 65536 is ok for me for now. Anyway if u want to set it add 'fs.file-max = 200000' to /etc/sysctl.conf pnix@pnix-a7:~$ cat /proc/sys/fs/fil...

Setup MySQL with Ofbiz

Download ofbiz weekily build and extract it somewhere you want. From your ofbiz directory, edit file entityengine.xml in framework/entity/config add new datasources below localmysql datasource part <datasource name="custommysql" helper-class="org.ofbiz.entity.datasource.GenericHelperDAO" field-type-name="mysql" check-on-start="true" add-missing-on-start="true" check-pks-on-start="false" use-foreign-keys="true" join-style="ansi-no-parenthesis" alias-view-columns="false" drop-fk-use-foreign-key-keyword="true" table-type="InnoDB" character-set="latin1" collate="latin1_general_cs"> <read-data reader-name="seed"/> <read-data reader-name="seed-initial"/> ...

Mount ISO, CUE/BIN, NRG, IMG, MDF files in ubuntu

I known that to mount iso file pnix@pnix-a7n:~$ sudo mount -o loop file.iso mountpoint or pnix@pnix-a7n:~$ sudo mount -o loop -t iso9660 file.iso mountpoint and for cue/bin file ,I convert it to iso first use bchunk pnix@pnix-a7n:~$ bchunk file.bin file.cue file.iso but how about the others. After some search, I collect tips to handle many types of image file in linux. For nrg [ nero image ], img [ clone cd] and mdf [ alcohol 120% ] files, We need nrg2iso, ccd2iso and mdf2iso to convert those image files to iso image. Luckily, All are in Feisty repos. pnix@pnix-a7n:~$ sudo aptitude install nrg2iso ccd2iso mdf2iso Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done Building tag database... Done The following NEW packages will be installed: ccd2iso mdf2iso nrg2iso 0 packages upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 19.1kB of archiv...

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