99 lines
4.3 KiB
Python
Executable File
99 lines
4.3 KiB
Python
Executable File
#!/usr/bin/python3
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import argparse
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import ast
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import sys
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import syslog
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import psutil
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from sonic_py_common import multi_asic
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import swsssdk
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def check_process_existence(container_name, process_cmdline):
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"""
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@summary: Check whether the process in the specified container is running or not and
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an alerting message will written into syslog if it failed to run.
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"""
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config_db = swsssdk.ConfigDBConnector()
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config_db.connect()
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feature_table = config_db.get_table("FEATURE")
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if container_name in feature_table:
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# We look into the 'FEATURE' table to verify whether the container is disabled or not.
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# If the container is diabled, we exit.
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if ("state" in feature_table[container_name]
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and feature_table[container_name]["state"] == "disabled"):
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sys.exit(0)
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else:
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# We leveraged the psutil library to help us check whether the process is running or not.
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# If the process entity is found in process tree and it is also in the 'running' or 'sleeping'
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# state, then it will be marked as 'running'.
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# For given feature we get the host and network namespace instances it's processes should be running
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# based on it's scope and add it to expected set.
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# From psutil we get number of running instances of the processes and add it to the the actual set
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# Difference bwetween expected and actual set provides instances where the processes are not running
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# and will be logged as syslog message by monit
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process_namespace_expected_set = set()
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process_namespace_found_set = set()
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has_global_scope = ast.literal_eval(feature_table[container_name].get('has_global_scope', 'True'))
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has_per_asic_scope = ast.literal_eval(feature_table[container_name].get('has_per_asic_scope', 'False'))
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if has_global_scope:
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process_namespace_expected_set.add(multi_asic.DEFAULT_NAMESPACE)
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if has_per_asic_scope:
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process_namespace_expected_set.update(multi_asic.get_namespace_list())
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for process in psutil.process_iter(["cmdline", "status", "pid"]):
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try:
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if ((' '.join(process.cmdline())).startswith(process_cmdline) and process.status() in ["running", "sleeping"]):
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process_namespace_found_set.add(multi_asic.get_current_namespace(process.info['pid']))
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except psutil.NoSuchProcess:
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pass
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process_namespace_diff_set = process_namespace_expected_set.difference(process_namespace_found_set)
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if process_namespace_diff_set:
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host_display_str = ""
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namespace_display_str = ""
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for ns in process_namespace_diff_set:
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if ns == multi_asic.DEFAULT_NAMESPACE:
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host_display_str = " in host"
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else:
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if not namespace_display_str:
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namespace_display_str = " in namespace " + ns
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else:
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namespace_display_str += ", " + ns
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join_str = " and" if host_display_str and namespace_display_str else ""
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# If this script is run by Monit, then the following output will be appended to
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# Monit's syslog message.
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print("'{}' is not running{}{}{}".format(process_cmdline, host_display_str, join_str, namespace_display_str))
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sys.exit(1)
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else:
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syslog.syslog(syslog.LOG_ERR, "container '{}' is not included in SONiC image or the given container name is invalid!"
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.format(container_name))
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def main():
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parser = argparse.ArgumentParser(description="Check whether the process in the specified \
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container is running and an alerting message will be written into syslog if it \
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failed to run.", usage="/usr/bin/process_checker <container_name> <process_cmdline>")
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parser.add_argument("container_name", help="container name")
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parser.add_argument("process_cmdline", nargs=argparse.REMAINDER, help="process command line")
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args = parser.parse_args()
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check_process_existence(args.container_name, ' '.join(args.process_cmdline))
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if __name__ == '__main__':
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main()
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