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Julius Kondratyev
Julius Kondratyev

Custom Snmpd Extension For Port checking

Note also if you get a mysql error Uncaught TypeError: mysqli_num_rows(): Argument #1, this is because you are using a newer mysql version which doesnt support UNBLOCKING for slave statuses, so you need to also include the line $chk_options['slave'] = false; into mysql.cnf to skip checking slave statuses

Custom snmpd extension for port checking

(Optional) If you have SELinux in Enforcing mode, you must add a module so the script can request /nginx-status: cat snmpd_nginx.temodule snmpd_nginx 1.0;require type httpd_t; type http_port_t; type snmpd_t; class tcp_socket name_connect;#============= snmpd_t ==============allow snmpd_t http_port_t:tcp_socket name_connect;EOFcheckmodule -M -m -o snmpd_nginx.mod snmpd_nginx.tesemodule_package -o snmpd_nginx.pp -m snmpd_nginx.modsemodule -i snmpd_nginx.pp

(Optional) If you have SELinux in Enforcing mode, you must add a module so the script can get redis informations and write them: cat snmpd_redis.temodule snmpd_redis 1.0;require type tmp_t; type redis_port_t; type snmpd_t; class tcp_socket name_connect; class dir add_name write ;#============= snmpd_t ==============allow snmpd_t redis_port_t:tcp_socket name_connect;allow snmpd_t tmp_t:dir write add_name ;EOFcheckmodule -M -m -o snmpd_redis.mod snmpd_redis.tesemodule_package -o snmpd_redis.pp -m snmpd_redis.modsemodule -i snmpd_redis.pp

The scan initially sends a bad ssh request to the target in order to retrieve the supported authorization methods. This allows you to determine how to connect to the target, which is helpful when you configure a custom ssh banner and then try to determine how to connect to the host.

Type a custom port range to instruct the scanners to scan the custom range of ports. Type a custom port range as a comma-delimited list of ports or port ranges. For example, 21,23,25,80,110 or 1-1024,8080,9000-9200. applies the custom range to the protocols you specify in the Local Port Enumerators section. If you want to scan both TCP and UDP, you can specify a split range specific to each protocol. For example, if you want to scan a different range of ports for TCP and UDP in the same policy, type T:1-1024,U:300-500. You can also specify a set of ports to scan for both protocols, as well as individual ranges for each separate protocol. For example, 1-1024,T:1024-65535,U:1025.

In the Managing Servers and Services with NMIS8 document we describe what mechanisms NMIS itself provides for managing non-SNMP services: e.g. checking ports, looking at process status, checking the DNS and checking textual protocols with send/expect scripts - and the recently added capability to run external programs for getting a service's status.

This page describes a more generic approach to this kind of problem which doesn't rely on custom features programmed into NMIS: instead we show how to extend the standard Net-SNMP snmpd with a script or program of your choice, to make an arbitrarily non-standard 'thing' accessible via SNMP (and thus available to NMIS).

snmpd's manual page describes a number of extensibility mechanisms, one of them called "pass_persist programs": snmpd starts that program and delegates an OID subtree to it. Whenever it is queried for variables in that subtree it forwards the request to the pass_persist program which provides an answer. As the communication is very simple (write to the program's STDIN, read from its STDOUT) it's a very flexible way of capturing custom things; It's also very efficient because the pass_persist program is running permanently and there is no repeated startup overhead, and the program can do whatever it needs to do, whenever and however it wants to.

Once you have captured your custom measurements and you've tested the snmpd-pass_persist interaction with snmpwalk or snmpget, the next step would be to extend the most appropriate model with your new measurements. This part is a straightforward modelling exercise, and you will find ample documentation in the NMIS section of this site, and lots of examples in the models-install/ directory of your NMIS installation.

The check_ntp_peer pluginchecks the health of an NTP server. It supports checking the offset with the sync peer, thejitter and stratum. This plugin will not check the clock offset between the local host and NTP server; please use ntp_time for that purpose.

Checkpoint has its own SNMP daemon that sits on port 260. UCD SNMP is also on SPLAT installs, and uses port 161. There is a line in /etc/snmp/snmpd.conf that tells UCD SNMP to proxy the Checkpoint specific OIDs to the Checkpoint SNMP.

Similar example for advanced notification apply rule filters: If the serviceattribute notes matches the has gold support 24x7 string AND one of thetwo condition passes, either the customer host custom variable is set to customer-xyOR the host custom variable always_notify is set to true.

It is also possible to generally apply a notification template and dynamically overwrite values fromthe template by checking for custom variables. This can be achieved by using conditional statements:

If the host object has a specific custom variable set, its value is inheritedinto the local notification object scope, e.g. host.vars.notification_interval,host.vars.notification_period and host.vars.notification_type.This overwrites attributes already specified in the imported mail-host-notificationtemplate.

The env command object attribute specifies a list of environment variables with values calculatedfrom custom variables which should be exported as environment variables prior to executing the command.

If a specific CheckCommand object provided with the Icinga Template Libraryneeds additional environment variables, you can import it into a new customCheckCommand object and add additional env keys. Example for the mysql_healthCheckCommand:

Customizing your node configuration allows you to configure or tune your operating system (OS) settings or the kubelet parameters to match the needs of the workloads. When you create an AKS cluster or add a node pool to your cluster, you can customize a subset of commonly used OS and kubelet settings. To configure settings beyond this subset, use a daemon set to customize your needed configurations without losing AKS support for your nodes.

Anything that can be automated via a script or a custom program canbe added into Xymon. A lot of extension scripts are available forBig Brother at the archive,and these will typically work without modifications if you run them inXymon. Sometimes a few minor tweaks are needed - the Xymon mailing listcan help you if you don't know how to go about that.

To extend SNMP agent functionality, custom scripts can be executed every timethe agent is being called. This can be achieved by usingarbitrary extensioncommands. The first step is to create a functionalscript of course, then upload it to your VyOS instance via the commandscp vyos@your_router:/config/user-data.Once the script is uploaded, it needs to be configured via the command below.

To verify the configuration, perform an snmpwalk in a terminal which should result in lots of output.If you don't get the output, we recommend checking your snmpd configuration for errors, restart snmpd and make sure that you have configured your firewalls correctly.

'; if (startsWith(current_url_path, "/ansible-core/")) msg += 'You are reading documentation for Ansible Core, which contains no plugins except for those in ansible.builtin. For documentation of the Ansible package, go to the latest documentation.'; else if (startsWithOneOf(current_url_path, ["/ansible/latest/", "/ansible/7/"])) /* temp extra banner to advertise AnsibeFest2021 */ banner += extra_banner; msg += 'You are reading the latest (stable) community version of the Ansible documentation. If you are a Red Hat customer, refer to the Ansible Automation Platform Life Cycle page for subscription details.'; else if (startsWith(current_url_path, "/ansible/2.9/")) msg += 'You are reading the latest Red Hat released version of the Ansible documentation. Community users can use this version, or select latest from the version selector to the left for the most recent community version.'; else if (startsWith(current_url_path, "/ansible/devel/")) /* temp extra banner to advertise AnsibleFest2021 */ banner += extra_banner; /* temp banner to advertise survey important = true; msg += 'Please take our Docs survey before December 31 to help us improve Ansible documentation.'; */ msg += 'You are reading the devel version of the Ansible documentation - this version is not guaranteed stable. Use the version selection to the left if you want the latest (stable) released version.'; else msg += 'You are reading an older version of the Ansible documentation. Use the version selection to the left if you want the latest (stable) released version.'; msg += '

Use ports 25, 587, or 2525 for non-encrypted communication between your system and Mailchimp Transactional. You can also use the STARTTLS extension (also known as TLS encryption) on these ports. For secure SSL connections, use port 465.

Step 4 ISE Profiler supports the ability to scan endpoints and trigger an SNMP query against the endpoint if determined to be SNMP-enabled. The default SNMP community string used for these queries is public. To use a different community string or sequence of strings, enter the new string values under Change custom SNMP community strings and enter again to confirm correct spelling.

Another requirement for either DHCP-based probe to be effective is that endpoints of interest must obtain their IP address using DHCP. This may seem obvious, but many customers may have clientless devices that have static IP address assignments. In those cases, it may be possible to deploy static DHCP reservations to allow endpoint to keep a specific IP address while also allowing centralized management of IP addressing and support for ISE profiling via DHCP.


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