147 lines
6.2 KiB
Diff
147 lines
6.2 KiB
Diff
From 11a63822fbdc0a9ebe1b668b26a59f1cc9649f6c Mon Sep 17 00:00:00 2001
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From: Oyvind Albrigtsen <oalbrigt@redhat.com>
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Date: Wed, 24 Oct 2018 14:51:27 +0200
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Subject: [PATCH] fence_scsi: watchdog retries support
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---
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agents/scsi/fence_scsi.py | 60 ++++++++++++++++++++----------
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tests/data/metadata/fence_scsi.xml | 4 +-
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2 files changed, 43 insertions(+), 21 deletions(-)
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diff --git a/agents/scsi/fence_scsi.py b/agents/scsi/fence_scsi.py
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index 79ada4fa..8a1e4c77 100644
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--- a/agents/scsi/fence_scsi.py
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+++ b/agents/scsi/fence_scsi.py
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@@ -158,13 +158,15 @@ def get_reservation_key(options, dev):
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return match.group(1) if match else None
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-def get_registration_keys(options, dev):
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+def get_registration_keys(options, dev, fail=True):
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reset_dev(options,dev)
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keys = []
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cmd = options["--sg_persist-path"] + " -n -i -k -d " + dev
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out = run_cmd(options, cmd)
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if out["err"]:
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- fail_usage("Cannot get registration keys")
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+ fail_usage("Cannot get registration keys", fail)
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+ if not fail:
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+ return []
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for line in out["out"].split("\n"):
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match = re.search(r"\s+0x(\S+)\s*", line)
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if match:
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@@ -218,9 +220,8 @@ def get_key(fail=True):
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try:
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f = open(file_path, "r")
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except IOError:
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- if fail:
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- fail_usage("Failed: Cannot open file \""+ file_path + "\"")
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- else:
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+ fail_usage("Failed: Cannot open file \""+ file_path + "\"", fail)
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+ if not fail:
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return None
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return f.readline().strip().lower()
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@@ -244,9 +245,8 @@ def dev_read(fail=True):
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try:
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f = open(file_path, "r")
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except IOError:
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- if fail:
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- fail_usage("Failed: Cannot open file \"" + file_path + "\"")
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- else:
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+ fail_usage("Failed: Cannot open file \"" + file_path + "\"", fail)
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+ if not fail:
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return None
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# get not empty lines from file
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devs = [line.strip() for line in f if line.strip()]
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@@ -371,14 +371,20 @@ def define_new_opts():
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}
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-def scsi_check_get_verbose():
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+def scsi_check_get_options(options):
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try:
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- f = open("/etc/sysconfig/watchdog", "r")
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+ f = open("/etc/sysconfig/stonith", "r")
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except IOError:
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- return False
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- match = re.search(r"^\s*verbose=yes", "".join(f.readlines()), re.MULTILINE)
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+ return options
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+
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+ match = re.findall(r"^\s*(\S*)\s*=\s*(\S*)\s*", "".join(f.readlines()), re.MULTILINE)
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+
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+ for m in match:
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+ options[m[0].lower()] = m[1].lower()
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+
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f.close()
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- return bool(match)
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+
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+ return options
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def scsi_check(hardreboot=False):
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@@ -388,7 +394,10 @@ def scsi_check(hardreboot=False):
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options["--sg_turs-path"] = "@SG_TURS_PATH@"
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options["--sg_persist-path"] = "@SG_PERSIST_PATH@"
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options["--power-timeout"] = "5"
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- if scsi_check_get_verbose():
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+ options["retry"] = "0"
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+ options["retry-sleep"] = "1"
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+ options = scsi_check_get_options(options)
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+ if "verbose" in options and options["verbose"] == "yes":
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logging.getLogger().setLevel(logging.DEBUG)
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devs = dev_read(fail=False)
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if not devs:
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@@ -399,11 +408,18 @@ def scsi_check(hardreboot=False):
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logging.error("Key not found")
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return 0
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for dev in devs:
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- if key in get_registration_keys(options, dev):
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- logging.debug("key " + key + " registered with device " + dev)
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- return 0
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- else:
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- logging.debug("key " + key + " not registered with device " + dev)
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+ for n in range(int(options["retry"]) + 1):
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+ if n > 0:
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+ logging.debug("retry: " + str(n) + " of " + options["retry"])
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+ if key in get_registration_keys(options, dev, fail=False):
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+ logging.debug("key " + key + " registered with device " + dev)
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+ return 0
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+ else:
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+ logging.debug("key " + key + " not registered with device " + dev)
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+
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+ if n < int(options["retry"]):
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+ time.sleep(float(options["retry-sleep"]))
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+
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logging.debug("key " + key + " registered with any devices")
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if hardreboot == True:
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@@ -452,7 +468,11 @@ def main():
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device(s). The result is that only registered nodes may write to the \
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device(s). When a node failure occurs, the fence_scsi agent will remove the \
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key belonging to the failed node from the device(s). The failed node will no \
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-longer be able to write to the device(s). A manual reboot is required."
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+longer be able to write to the device(s). A manual reboot is required.\
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+\n.P\n\
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+When used as a watchdog device you can define e.g. retry=1, retry-sleep=2 and \
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+verbose=yes parameters in /etc/sysconfig/stonith if you have issues with it \
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+failing."
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docs["vendorurl"] = ""
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show_docs(options, docs)
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diff --git a/tests/data/metadata/fence_scsi.xml b/tests/data/metadata/fence_scsi.xml
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index 45a84168..b8cdabd1 100644
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--- a/tests/data/metadata/fence_scsi.xml
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+++ b/tests/data/metadata/fence_scsi.xml
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@@ -1,7 +1,9 @@
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<?xml version="1.0" ?>
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<resource-agent name="fence_scsi" shortdesc="Fence agent for SCSI persistent reservation" >
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<longdesc>fence_scsi is an I/O fencing agent that uses SCSI-3 persistent reservations to control access to shared storage devices. These devices must support SCSI-3 persistent reservations (SPC-3 or greater) as well as the "preempt-and-abort" subcommand.
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-The fence_scsi agent works by having each node in the cluster register a unique key with the SCSI device(s). Once registered, a single node will become the reservation holder by creating a "write exclusive, registrants only" reservation on the device(s). The result is that only registered nodes may write to the device(s). When a node failure occurs, the fence_scsi agent will remove the key belonging to the failed node from the device(s). The failed node will no longer be able to write to the device(s). A manual reboot is required.</longdesc>
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+The fence_scsi agent works by having each node in the cluster register a unique key with the SCSI device(s). Once registered, a single node will become the reservation holder by creating a "write exclusive, registrants only" reservation on the device(s). The result is that only registered nodes may write to the device(s). When a node failure occurs, the fence_scsi agent will remove the key belonging to the failed node from the device(s). The failed node will no longer be able to write to the device(s). A manual reboot is required.
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+
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+When used as a watchdog device you can define e.g. retry=1, retry-sleep=2 and verbose=yes parameters in /etc/sysconfig/stonith if you have issues with it failing.</longdesc>
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<vendor-url></vendor-url>
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<parameters>
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<parameter name="action" unique="0" required="1">
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