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[Cluster-devel] Eaton fence agent and more power devices support



Hi Marek and the list,

First of all, happy new year to you all: health, happiness and ... high availability ;-)

I've just derived a fence_eaton_snmp script, based on fence_apc_snmp.
You'll find attached the diff against the latest fence-agents repository.

This has been tested with the suitable hardware (Eaton Managed ePDU): http://www.epdu.com
Can you please merge this for the next cman releases.

As a side note, I'm thinking about:
- making one fence_pdu_snmp to group all this code (sysOID brings the smartness of knowing which data should be used), or at least create some common grounds to factorize code,
- making a fence_nut_devices (or fence_power_devices) to use NUT [1] to do the same for all supported serial / USB / SNMP / HTTP devices (ie UPS, PDU and SCD).

Feedback and comments are welcome.

cheers,
Arnaud
--
[1] http://new.networkupstools.org & http://www.networkupstools.org
--
Linux / Unix Expert R&D - Eaton - http://powerquality.eaton.com
Network UPS Tools (NUT) Project Leader - http://www.networkupstools.org/
Debian Developer - http://www.debian.org
Free Software Developer - http://arnaud.quette.free.fr/

diff --git a/configure.ac b/configure.ac
index fd441e7..639769f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -224,6 +224,7 @@ AC_CONFIG_FILES([Makefile
 		 fence/agents/cpint/Makefile
 		 fence/agents/drac/Makefile
 		 fence/agents/drac5/Makefile
+		 fence/agents/eaton_snmp/Makefile
 		 fence/agents/egenera/Makefile
 		 fence/agents/eps/Makefile
 		 fence/agents/ibmblade/Makefile
diff --git a/fence/agents/Makefile.am b/fence/agents/Makefile.am
index 3a91ed4..945b49b 100644
--- a/fence/agents/Makefile.am
+++ b/fence/agents/Makefile.am
@@ -13,6 +13,7 @@ SUBDIRS 		= lib \
 			  cpint \
 			  drac \
 			  drac5 \
+			  eaton_snmp \
 			  egenera \
 			  eps \
 			  ibmblade \
diff --git a/fence/agents/eaton_snmp/Makefile.am b/fence/agents/eaton_snmp/Makefile.am
new file mode 100644
index 0000000..dad91c9
--- /dev/null
+++ b/fence/agents/eaton_snmp/Makefile.am
@@ -0,0 +1,16 @@
+MAINTAINERCLEANFILES	= Makefile.in
+
+TARGET			= fence_eaton_snmp
+
+EXTRA_DIST		= $(TARGET).py \
+			  README
+
+sbin_SCRIPTS		= $(TARGET)
+
+dist_man_MANS		= $(TARGET).8
+
+include $(top_srcdir)/make/fencebuild.mk
+include $(top_srcdir)/make/fenceman.mk
+
+clean-local: clean-man
+	rm -f $(TARGET)
diff --git a/fence/agents/eaton_snmp/README b/fence/agents/eaton_snmp/README
new file mode 100644
index 0000000..82619d7
--- /dev/null
+++ b/fence/agents/eaton_snmp/README
@@ -0,0 +1,20 @@
+This is an snmp based fence agent for Eaton power distribution units to be used
+with RHEL4 Red Hat Cluster Suite.
+
+In order to use this agent, you will need to have net-snmp-utils installed 
+on every node in your cluster. net-snmp-utils is scheduled for inclusion 
+in the base RHEL distribution for Update 4, and is yummable in FC5.
+
+To use the agent, cp the agent to the /sbin directory on every
+cluster node.
+
+Then define a <fencedevice> in the cluster.conf file with
+agent="fence_eaton_snmp" as an attribute, and use it that way.
+Note, please, that the GUI does not support this agent yet, and you will have
+to edit your cluster.conf by hand and then propagate it yourself. If you need
+help with this, email me at the address below.
+
+The interface for the fence_eaton_snmp agent is identical to the existing
+fence_apc_snmp agent, upon which it has been derived.
+
+--Arnaud Quette - ArnaudQuette Eaton com
diff --git a/fence/agents/eaton_snmp/fence_eaton_snmp.py b/fence/agents/eaton_snmp/fence_eaton_snmp.py
new file mode 100755
index 0000000..b02cfd1
--- /dev/null
+++ b/fence/agents/eaton_snmp/fence_eaton_snmp.py
@@ -0,0 +1,177 @@
+#!/usr/bin/python
+
+# The Following agent has been tested on:
+# - Eaton ePDU managed - SNMP v1
+
+import sys, re, pexpect
+sys.path.append("@FENCEAGENTSLIBDIR@")
+from fencing import *
+from fencing_snmp import *
+
+#BEGIN_VERSION_GENERATION
+RELEASE_VERSION="Eaton SNMP fence agent"
+REDHAT_COPYRIGHT=""
+BUILD_DATE=""
+#END_VERSION_GENERATION
+
+### CONSTANTS ###
+# oid defining fence device
+OID_SYS_OBJECT_ID='.1.3.6.1.2.1.1.2.0'
+
+### GLOBAL VARIABLES ###
+# Device - see EatonManagedePDU
+device=None
+
+# Port ID
+port_id=None
+# Switch ID
+switch_id=None
+
+# Classes describing Device params
+class EatonManagedePDU:
+	status_oid=      '.1.3.6.1.4.1.534.6.6.6.1.2.2.1.3.%d'
+	control_oid=     '.1.3.6.1.4.1.534.6.6.6.1.2.2.1.3.%d'
+	outlet_table_oid='.1.3.6.1.4.1.534.6.6.6.1.2.2.1.1'
+	ident_str="Eaton Managed ePDU"
+	state_off=0
+	state_on=1
+	state_cycling=2
+	turn_off=0
+	turn_on=1
+	turn_cycle=2
+	# FIXME: what's this?
+	has_switches=False
+
+### FUNCTIONS ###
+def eaton_set_device(conn,options):
+	global device
+
+	agents_dir={'.1.3.6.1.4.1.534.6.6.6':EatonManagedePDU}
+
+	# First resolve type of Eaton
+	eaton_type=conn.walk(OID_SYS_OBJECT_ID)
+
+	if (not ((len(eaton_type)==1) and (agents_dir.has_key(eaton_type[0][1])))):
+		eaton_type=[[None,None]]
+
+	device=agents_dir[eaton_type[0][1]]
+
+	conn.log_command("Trying %s"%(device.ident_str))
+
+def eaton_resolv_port_id(conn,options):
+	global port_id,switch_id,device
+
+	if (device==None):
+		eaton_set_device(conn,options)
+
+	# Now we resolv port_id/switch_id
+	if ((options["-n"].isdigit()) and ((not device.has_switches) or (options["-s"].isdigit()))):
+		port_id=int(options["-n"])
+
+		if (device.has_switches):
+			switch_id=int(options["-s"])
+	else:
+		table=conn.walk(device.outlet_table_oid,30)
+
+		for x in table:
+			if (x[1].strip('"')==options["-n"]):
+				t=x[0].split('.')
+				if (device.has_switches):
+					port_id=int(t[len(t)-1])
+					switch_id=int(t[len(t)-3])
+				else:
+					port_id=int(t[len(t)-1])
+
+	if (port_id==None):
+		fail_usage("Can't find port with name %s!"%(options["-n"]))
+
+def get_power_status(conn,options):
+	global port_id,switch_id,device
+
+	if (port_id==None):
+		eaton_resolv_port_id(conn,options)
+
+	oid=((device.has_switches) and device.status_oid%(switch_id,port_id) or device.status_oid%(port_id))
+
+	(oid,status)=conn.get(oid)
+	return (status==str(device.state_on) and "on" or "off")
+
+def set_power_status(conn, options):
+	global port_id,switch_id,device
+
+	if (port_id==None):
+		eaton_resolv_port_id(conn,options)
+
+	oid=((device.has_switches) and device.control_oid%(switch_id,port_id) or device.control_oid%(port_id))
+
+	conn.set(oid,(options["-o"]=="on" and device.turn_on or device.turn_off))
+
+
+def get_outlets_status(conn, options):
+	global device
+
+	result={}
+
+	if (device==None):
+		eaton_set_device(conn,options)
+
+	res_ports=conn.walk(device.outlet_table_oid,30)
+
+	for x in res_ports:
+		t=x[0].split('.')
+
+		port_num=((device.has_switches) and "%s:%s"%(t[len(t)-3],t[len(t)-1]) or "%s"%(t[len(t)-1]))
+
+                port_name=x[1].strip('"')
+                port_status=""
+                result[port_num]=(port_name,port_status)
+
+        return result
+
+# Define new options
+def eaton_snmp_define_defaults():
+	all_opt["snmp_version"]["default"]="1"
+	all_opt["community"]["default"]="private"
+
+# Main agent method
+def main():
+	device_opt = [ "help", "version", "agent", "quiet", "verbose", "debug",
+		       "action", "ipaddr", "login", "passwd", "passwd_script",
+		       "test", "port", "separator", "no_login", "no_password",
+		       "snmp_version", "community", "snmp_auth_prot", "snmp_sec_level",
+		       "snmp_priv_prot", "snmp_priv_passwd", "snmp_priv_passwd_script",
+		       "udpport","inet4_only","inet6_only",
+		       "power_timeout", "shell_timeout", "login_timeout", "power_wait" ]
+
+	atexit.register(atexit_handler)
+
+	snmp_define_defaults ()
+	eaton_snmp_define_defaults()
+
+	options=check_input(device_opt,process_input(device_opt))
+
+        ## Support for -n [switch]:[plug] notation that was used before
+	if ((options.has_key("-n")) and (-1 != options["-n"].find(":"))):
+		(switch, plug) = options["-n"].split(":", 1)
+		if ((switch.isdigit()) and (plug.isdigit())):
+		        options["-s"] = switch
+			options["-n"] = plug
+
+	if (not (options.has_key("-s"))):
+		options["-s"]="1"
+
+	docs = { }
+	docs["shortdesc"] = "Fence agent for Eaton over SNMP"
+	docs["longdesc"] = "fence_eaton_snmp is an I/O Fencing agent \
+which can be used with the Eaton network power switch. It logs \
+into a device via SNMP and reboots a specified outlet. It supports \
+SNMP v1 and v3 with all combinations of  authenticity/privacy settings."
+	docs["vendorurl"] = "http://powerquality.eaton.com";
+	show_docs(options, docs)
+
+	# Operate the fencing device
+	result = fence_action(FencingSnmp(options), options, set_power_status, get_power_status, get_outlets_status)
+
+	sys.exit(result)
+if __name__ == "__main__":
+	main()

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