Custom HA agent - Red Hat Linux Cluster Post: 302455973

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Operating Systems Linux Red Hat Custom HA agent - Red Hat Linux Cluster Post 302455973 by pshaikh on Thursday 23rd of September 2010 07:30:11 AM

09-23-2010

Registered User

Hi fpmurphy

I looked in /usr/share/cluster/script.sh (and I think that's the template for custom app failover?). Here is how it looks like

Code:

#
# Script to handle a non-OCF script (e.g. a normal init-script)
#

LC_ALL=C
LANG=C
PATH=/bin:/sbin:/usr/bin:/usr/sbin
export LC_ALL LANG PATH

. $(dirname $0)/ocf-shellfuncs

meta_data()
{
    cat <<EOT
<?xml version="1.0"?>
<resource-agent version="rgmanager 2.0" name="script">
    <version>1.0</version>
.....
}

case $1 in
        meta-data)
                meta_data
                exit 0
                ;;
        *)
                ;;
esac

[ -n "${OCF_RESKEY_file}" ] || exit $OCF_ERR_ARGS      # Invalid Argument
[ -f "${OCF_RESKEY_file}" ] || exit $OCF_ERR_INSTALLED # Program not installed
[ -x "${OCF_RESKEY_file}" ] || exit $OCF_ERR_GENERIC   # Generic error

# Don't need to catch return codes; this one will work.
ocf_log info "Executing ${OCF_RESKEY_file} $1"
${OCF_RESKEY_file} $1

declare -i rv=$?
if [ $rv -ne 0 ]; then
        ocf_log err "script:$OCF_RESKEY_name: $1 of $OCF_RESKEY_file failed (returned $rv)"
        exit $OCF_ERR_GENERIC
fi

Using above template i have created 'dummy_service.sh' and added status, start, stop, verify-all, monitor options in it (looking at apache.sh) to start, stop, monitor, verify my application is running (actually i am just trying to start httpd and stop it for now before going to more complex custom app)

If you like I can attach that script too.

Thanks

---------- Post updated 23-09-10 at 12:57 AM ---------- Previous update was 22-09-10 at 11:25 PM ----------

Alright it seems like 'script.sh' is not template for custom failover script

It is actually a resource agent for 'script' resource, in this script resource we need to provide path for /etc/init.d/<my script>

However this is a bit limiting, there are some unknown caveats like how to find out a node from which service is failed over (name of node on which service was previously running) and accessing shared resources (e.g. floating IP addresses)

---------- Post updated at 06:30 AM ---------- Previous update was at 12:57 AM ----------

I was able to set up custom HA agent; looking at few more options,

Thanks

Last edited by pshaikh; 09-23-2010 at 01:32 AM..

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LEARN ABOUT SUNOS

dirname

basename(1)							   User Commands						       basename(1)

NAME

       basename, dirname - deliver portions of path names

SYNOPSIS

       /usr/bin/basename string [suffix]

       /usr/xpg4/bin/basename string [suffix]

       dirname string

DESCRIPTION

       The  basename  utility deletes any prefix ending in / and the suffix (if present in string) from string, and prints the result on the stan-
       dard output. It is normally used inside substitution marks (``) within shell procedures.

   /usr/bin
       The suffix is a pattern defined on the expr(1) manual page.

   /usr/xpg4/bin
       The suffix is a string with no special significance attached to	any of the characters it contains.

       The dirname utility delivers all but the last level of the path name in string.

EXAMPLES

       Example 1: Setting environment variables

       The following example, invoked with the argument /home/sms/personal/mail sets the environment variable NAME to the file named mail and  the
       environment variable MYMAILPATH to the string  /home/sms/personal:

       example% NAME=`basename $HOME/personal/mail`
       example% MYMAILPATH=`dirname $HOME/personal/mail`

       Example 2: Compiling a file and moving the output

       This  shell  procedure,	invoked  with  the argument /usr/src/bin/cat.c, compiles the named file and moves the output to cat in the current
       directory:

       example% cc $1
       example% mv a.out `basename $1 .c`

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect  the execution of basename and  dirname:  LANG,  LC_ALL,
       LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

   /usr/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

   /usr/xpg4/bin
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWxcu4			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       expr(1), basename(3C), attributes(5), environ(5), standards(5)

SunOS 5.10							    18 Mar 1997 						       basename(1)