41 lines
1.9 KiB
Plaintext
41 lines
1.9 KiB
Plaintext
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README.systemd
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--------------
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Net-SNMP provides two daemons, which support systemd system manager.
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See http://www.freedesktop.org/wiki/Software/systemd to learn how
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systemd works. Both socket activation and notification is supported by these
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daemons.
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To enable systemd support, the sources must be compiled with
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--with-systemd configure option.
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snmpd - The SNMP agent
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----------------------
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Socket activation od snmpd daemon is implemented, but it's discouraged.
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The reason is simple - snmpd not only listens and processes SNMP requests
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from network, but also gathers system statistics counters, sends traps and
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communicates with subagents. It even opens few netlink sockets.
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In other words, snmpd should run from system start to properly work.
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This can be done in two ways:
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1) either as snmpd service unit with 'Type=notification' and without a socket
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unit
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2) or as snmpd service unit with 'Type=simple', appropriate socket socket unit
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and the snmpd service enabled. This way systemd creates the snmpd listening
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socket early during boot and passes the sockets to snmpd slightly later
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(but still during machine boot). This way systemd can paralelize start of
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services, which depend on snmpd. Admins must adjust the socket file manually,
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depending if the snmpd support AgentX, IPv6, SMUX etc.
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snmpd should be started with '-f' command line parameter to disable forking -
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systemd does that for us automatically.
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snmptrapd - The trap processing daemon
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--------------------------------------
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snmptrapd supports full socket activation and also notification (if needed).
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Both 'Type=simple' (with appropriate socket unit) and 'Type=notify' services
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will work. Again, '-f' parameter should be provided on snmptrapd command line.
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If integration with SNMP agent using AgentX protocol is enabled, snmptrapd should
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start during boot and not after first SNMP trap arrives. Same rules as for snmpd
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applies then.
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