Jun 17 10:57:15 nc systemd[1]: cmk-agent-ctl-daemon. 0p10 Agent socket: operational IP allowlist: any Connection: localhost:8001/cmk UUID: 186f71b9-8d6f-41c6-be44-bb1f7c23ae7b Local: Connection. deb. The Agent Controller cmk-agent-ctl is the component within the agent that is responsible for transporting the data collected by the agent script. Please execute with sufficient permissions (maybe try 'sudo'). Der Linux-Agent der Checkmk-Version 2. This morning all Windows Agents were suddenly no longer registered. domain. Become a Dealer. If it is xinetd remove the. com:8000/cmk. cfg. 0 the new Linux agent with the Agent Controller supports the registered, TLS-encrypted and compressed pull mode. I am trying to register an agent installed on a Windows Server 2019. ╰─$ sudo cmk-agent-ctl status Version: 2. com:443 -i cmk --user automation . service: Scheduled restart job, restart counter is at 2. For Debian remove the cmk-agent and purge the configuration, than reinstall the agent, this purges the xinetd configuration. 2. 02. Checkmk Enterprise Edition 2. 1. 04 - CMK RAW) where communication with the agent keeps giving errors "[agent] Communication failed: [Errno 104] Connection reset by peer - Got no information from host - execution time 0. The Hostname is the familiar name that Checkmk will use for the monitoring. 0. 0p20 Ubuntu 20. But if cmk-agent-ctl cannot be started, access fails. The Agent Controller cmk-agent-ctl is the component within the agent that is responsible for transporting the data collected by the agent script. After that I got the error: Version: 2. Update: Nervermind. socket systemctl status cmk-agent-ctl-daemon. Hello. Checkmk Community Trouble after upgrading to 2. exe – register --trust-cert’ USAGE: cmk-agent-ctl. Agent Updater (Agentenbäckerei), Discovery des Agent Controller Ports, mit Transportverschlüsselung. I dont know why this folder could not be created during cmk agent installation from the cmk-agent-useradd. ourcompany. 1. CMK version: 2. The controller is executed under the cmk-agent user, which has limited privileges, e. The service is started. To register the agent, I ran: sudo cmk-agent-ctl register --hostname localhost --server localhost:8001 --site cmk --user cmkadmin That gives: > sudo cmk-agent-ctl status Version: 2. exe' register -s checkmk. Please provide me with the output of: systemctl status check-mk-agent. mschlenker (Mattias Schlenker) July 8, 2022, 8:12am 4. deb The monitored system is in a local network and have. Another gotcha I came across was trying to run the register, make sure you are using admin cmd ( which you are ), then cut and paste the command in full : “C:\Program Files (x86)\checkmk\service\cmk-agent-ctl. Thx for the quick reply, adding the port gives still the same result: root@paperless-ngx:~# cmk-agent-ctl register --trust-cert -H paperless-ngx. copy the cmk-agent-ctl for the architecture you are using to e. service --now $ sudo systemctl restart check-mk-agent. CMK version: 2. 6 LTS Package: check-mk-raw-2. The register command cmk-agent-ctl register often gets confused with the Agent update registration cmk-agent-update register, but these are two different registration types: one for TLS encryption and one for registering automatic updates (Agent Bakery, cee). I’m running 2. In your case. Something like this. So now you must de-register, on the host: cmk-agent-ctl delete-all --enable-insecure-connections Then on the CMK server: Properties of host, then menu entry Host > Remove TLS registration Afterwards connections should work albeit insecure. Anders (Anders) November 27, 2022, 4:25pm 1 CMK version: 2. 0p10 Agent socket: operational IP allowlist: any Connection: localhost:8001/cmk UUID: 186f71b9-8d6f-41c6-be44-bb1f7c23ae7b Local: Connection. You can display. Here you can enter a host’s name simply in order to view the host’s configuration (e. Either related to the recent update to p12 or to a migration vom Ubuntu 20 to 22 (new server with new checkmk installation, restored site from backup). We strongly recommend to enable TLS by registering the host to the site (using the `cmk-agent-ctl register` command on the monitored host). service I see this error: ERROR [cmk_agent_ctl] Failed to listen on TCP socket for incoming pull connections. 2. Ping works, Agent reports Communication Failed: timed out. rs:14: st… As mentioned in another thread, you actually ran into a newly implemented CSR version check that’s. exe” register. The cmk-agent user is created during the installation of the agent. 2. In checkmk for the host service got below warning. 3, no problem on installing, and registering the site and the localhost, but with windows keeps me throwing a crit state with the Check_MK Service. Please provide me with the output of: systemctl status check-mk-agent. The cmk-agent user was sucessfully created. In case it is left out, the agent controller tries to query the port from the REST API. Jun 17 10:57:15 nc systemd[1]: cmk-agent-ctl-daemon. 1. Dann hast du die Herangehensweise schon gefunden, wenn man die Zertifikate noch nicht im Griff hat. 1. Caused by: 0: Failed to set group id 998 corresponding to user cmk-agent 1: EPERM: Operation not permitted However, when I run the command using sudo, I end up with the following output. As suggested in another post i read i checked:-that port 8000 is open-omd config show | grep AGENT_RECEIVER show port 8000I think problem is in that a cloned account has all the same paths of it’s original account, i had cloned automation → automation2 as i had problems witth update agent not liking secrets meanwhile tls registration wanted secrets i think. Troubleshooting. pem. 1. Redirecting to /bin/systemctl reload xinetd. 1 gave 404 Not Found: Host 127. Bei der Registrierung der Agents ergibt sich bei beiden Server folgender Fehler: <HOST>:~ # cmk-agent-ctl register --hostname <HOSTNAME> --server 192. For Debian remove the cmk-agent and purge the configuration, than reinstall the agent, this purges the xinetd configuration. The added executable is called cmk-agent-ctl. 1. local --server 10. sh script. So, Checkmk is ready. root@kerneltalks # service xinetd reload. Welcome to Checkmk. Now you need to register the agnet for TLS handshake. no login shell, and is used only for data transfer. INFO [cmk_agent_ctl::site_spec] Failed to discover agent receiver port using ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both with and Run with verbose output to see errors. 0 adds the Agent Controller and new features to the agent program. I am trying to register an agent installed on a Windows Server 2019. ColinP November 12, 2022, 12:44pm 1. OK, let’s figure out who is doing what. B. After reading the warning message The agent controller is operating in an insecure mode I started to read the docs on what should be done. Agent auf allen Monitored Hosts installiert. 0 or earlier. However, the certificate rolled out by the agent updater ruleset seems to be insufficient. no login shell, and is used only for data transfer. Baked and signed the agent. We tried setting a firewall rule to the port 8000, we tried using the automation user, the checkmk_admin user, and a random admin user. Now the service is active and listening. 0 Agent socket: inoperational (!!)The agent control use the port 8000 for communication. Version: 2. If it is systemd please give us the output of systemctl --version. 04. cmk-agent-ctl register --hostname myhost --server checkmk. I am experiencing a problem with registering the agent: CMK version: 2. The challenge is registering an agent, i. 2 system. g. The cmk-agent user is created during the installation of the agent. deb Now the cmk-agent-ctl-daemon. cmk-agent-ctl register --server cmkserver:443 --trust-cert --site cmksite --user username --password password --hostname monitoringhost On Debian 11 if got the following outputThe Linux agent of Checkmk version 2. 2. net -i STAR -P 'XXXXX' -U automation -H sys-vbr02 Apparently I’m too stupid to find the correct call for agent registration via REST API in any documentation. d, only the check-mk-agent can be found: [root@jumphost]# cmk-agent-ctl register --hostname myclient \. 0b4_0 raw OS: Ubuntu 20. The controller is executed under the cmk-agent user, which has limited privileges, e. 0p10 OS: linux The hosts agent supports TLS, but it is not being used. 1 Like. The port can either be included in the server name argument ( -s ), or it can be left out. 1. sh script. 1 does not exist. Ultimately, Checkmk was showing the agents were not registered because they were not in fact registered. Registered and installed a Let’s Encrypt certificate using certbot; I can now access the web UI without a problem using but after setting up the host I can’t install an agent using the following command: cmk-agent-ctl register -H -s monitoring. The cmk-agent user is created during the installation of the agent. This might be a bug. I am not able to debug the cmk-agent-ctl since it is in binary form: You can display command help with cmk-agent-ctl help, also for specific available subcommands, with cmk-agent-ctl help register for example. xyz:9800 --site cmk --user BAR --password FOO. 1. deb Monitored System (Host): Checkmk Agent version: 2. 1 Like. This topic was automatically closed 365 days after the last reply. The controller is executed under the cmk-agent user, which has limited privileges, e. So if you make any changes to the config file then you need to reload configuration or restart the agent. rs:14: starting [2023-02-10 12:54:18. The Linux agent of Checkmk version 2. service systemctl stop check-mk-agent. It has to match the actual hostname used by the Checkmk server, found under “Setup” > “Hosts”. local:8000 -s checkmk. But if cmk-agent-ctl cannot be started, access fails. 0 OS Version: Appliance 1. 2 system. net -i STAR -P 'XXXXX' -U automation -H sys-vbr02Apparently I’m too stupid to find the correct call for agent registration via REST API in any documentation. The Agent Receiver tells the Agent Controller. ss -tulpn | grep 6556 tcp LISTEN 0 4096 *:6556 : users:((“cmk-agent-ctl”,pid=425,fd=9)) On the. In order to register at a Checkmk site, the agent controller ( cmk-agent-ctl) needs to know, among others, the name of the server where the site is running and a port. 0p15. 3. to checkmk. I had to add the checkmk user again. exe' register -s checkmk. When trying to register the checkmk agent: Access is denied:. „TLS is not activated on monitored host (see details)“. rs:14: starting [2023-02-10 12:54:18. I dont know why this folder could not be created during cmk agent installation from the cmk-agent-useradd. You have three options here: Make the REST API call work. Copy the cmk-update-agent binary or the cmk_update_agent. You can display command help with cmk-agent-ctl help, also for specific available subcommands, with cmk-agent-ctl help register for example. 0. " Jun 17 10:57:15 nc systemd[1]: cmk-agent-ctl-daemon. 0. mschlenker (Mattias Schlenker) July 8, 2022, 8:12am 4. The registration is done using the Agent Controller cmk-agent-ctl, which provides a command interface for configuring the connections. CMK Checkmk Enterprise Edition 2. Now you need to register the agnet for TLS handshake. de --server monitor. socket failed. 0. cre root@9529f647cd27:/# omd sites SITE VERSION COMMENTS cmk 2. en. Distribute below files from new baked agent to all agents that were baked with expired certificate. Password: explicit. domain. 1 i’m trying to automate the process of registering our updated windows hosts to thee monitoring for tls encryption. when i executing the command remotely via powershell i’m. 04. Open the terminal that you want to monitor on your Linux server. If the host is monitored by multiple sites, you must register to all of them. 0b4-1_all. 02. g. hardware:~#] cmk-agent-ctl. 0. 1. en. Whether the host is configured for the pull mode (all editions) or the push mode (only the Cloud Edition) makes no difference for the command examples. I think the docs aren’t clear on what should be done if ss -tulpn | grep 6556 shows that systemd or xinetd are listening on 6556 instead of cmk-agent-ctl, and what one should do to have cmk-agent-ctl working. B. In your case doing proxy. Monitoring Windows - The new agent for Windows in detail. Hi everyone, below is the output of the “cmk-agent-ctl. When you have done all this, install the agent again and it will work properly. If you want to use the agent in legacy mode, you need to disable cmk-agent-ctl in bakery rules. 0. I am trying to register an agent installed on a Windows Server 2019. 0:8282 --site cmk --user automation --password <RANDOMPASSWORD> Attempting to. If the server you want to monitor and register is the monitoring docker. Dazu verwendet Checkmk teils eigene, teils bereits existierende Plugins. But when the distributed server wants to query the remote agent: [agent] Communication failed: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl. The folder /var/lib/cmk-agent was missing on my SUSE Linux Enterprise Micro 5. This might be a bug. raptorswithhats. I try with: cmk-agent-ctl register --hostname MYHOST --server CMKHOST --site MYSITE --user cmkadmin --password ‘MYPASSWORD’ Then I get the message: Thx for the quick reply, adding the port gives still the same result: root@paperless-ngx:~# cmk-agent-ctl register --trust-cert -H paperless-ngx. Now you need to register the agnet for TLS handshake. You already entered the right command with openssl s_client -connect SLAVE01:443. However, there is a difference between console output of “cmk-agent-ctl status” and “cmk_agent_ctl_status” from agent output (downloaded via “Download. andreas-doehler (Andreas) January 8, 2023, 3:48pm 2. But if cmk-agent-ctl cannot be started, access fails. 0 the new Linux agent with the Agent Controller supports the registered, TLS-encrypted and compressed pull mode. OS: Windows Server 2019. g. 0 Zeiten registriert) Registrierung über den Servernamen “checkmk” meines CheckMK Servers und der Instanz “lexx”. In order to register at a Checkmk site, the agent controller ( cmk-agent-ctl) needs to know, among others, the name of the server where the site is running and a port. socket systemctl status cmk-agent-ctl-daemon. Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins) I have registered over 100 hosts successfull but something is wrong with this one when I use that command: & 'C:Program Files (x86)checkmkservicecmk-agent-ctl. 1 and the site to 2. The folder /var/lib/cmk-agent was missing on my SUSE Linux Enterprise Micro 5. 1 does not exist. to switch your agent into SSL mode (and not legacy mode), but that’s a different subject. 488899 +01:00] INFO [cmk_agent_ctl] srcmain. , I had to put the public hostname). mydomain. This might be a bug. We will be asked for some information about the host. 1. Installed the agent on a Server (Windows and Ubuntu) Registered the agent with the following command: cmk-agent-ctl register --hostname --server --site --user automation --password. Hi, Some days ago i was testing this software, do a few tests and lately installed on a VM runing linux mint 20. The register command cmk-agent-ctl register often gets confused with the Agent update registration cmk-agent-update register, but these are two different registration types: one for TLS encryption and one for registering automatic updates (Agent Bakery, cee). Use the cmk-agent-ctl register command to register. Ikkarus13 (Sascha Kunimünch) May 30, 2022, 8:00am 1. To be more precise:. DEBUG [cmk_agent_ctl::modes::pull] handle_request starts DEBUG [rustls::server::hs] decided upon suite TLS13_AES_256_GCM_SHA384 WARN [rustls::conn] Sending fatal alert HandshakeFailure DEBUG [cmk_agent_ctl::modes::renew_certificate] Checking registered connections for certificate expiry. Registration indeed is good. The Agent Receiver tells the Agent Controller. So if you make any changes to the config file then you need to reload configuration or restart the agent. If you want to use the agent in legacy mode, you need to disable cmk-agent-ctl in bakery rules. cmk-update-agent –v. 1. DOMAIN. 1 i’m trying to automate the process of registering our updated windows hosts to thee monitoring for tls encryption. After the installation everything worked. Agent pairing; Read access to all hosts and folders Since Checkmk version 2. The Windows agent of Checkmk version 2. register ^. The controller is executed under the cmk-agent user, which has limited privileges, e. 0 ergänzt das Agentenskript mit dem Agent Controller und neuen Funktionen. CMK 2. deb Now the cmk-agent-ctl-daemon. –user automation --password “xxx”. NOTE: A registered host will refuse all unencrypted connections. 1. cee Ubuntu 16. „TLS is not activated on monitored host (see details)“. What I already tried: I tried only listening on ports 80 and 443 for caddy, with{"serverDuration": 18, "requestCorrelationId": "a42ce0e7c5a94b2c8eb93184953f1289"} Checkmk Knowledge Base {"serverDuration": 18, "requestCorrelationId. 0p10 Agent socket: operational IP allowlist: any Connection: localhost:8001/cmk UUID: 186f71b9-8d6f-41c6-be44-bb1f7c23ae7b Local: Connection. New install of CMK (via RPM) - trying to just register the localhost agent. Home ; Categories ;Registration indeed is good. root@kerneltalks # service xinetd reload. Open the terminal that you want to monitor on your. socket), aborting``` If I als run the daemon: ```cmk-agent-ctl daemon &``` It starts responding to status command, but still won't register the node: ```root@adfb306b5d58:/# cmk-agent-ctl status Version: 2. 1 the monitoring data sent from the monitored host to the monitoring server is TLS encrypted and compressed by default. Reload check_mk configuration using below command –. Wie soll ich nun aber auf Hunderten von Host TLS aktivieren?Hi, I have an issue with the registration of some agents on a site : when I run the cmk-agent-ctl register the process crashed on server-side after 10/15 seconds. folgenden Register Befehl benutzt. root@mgmonitor02:~# cmk-agent-ctl register --hostname MGMonitor --server localhost --site sitename --user omd --password omd ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both with and (MD) December 17, 2021, 4:52am 3. service should work as expected. 0 2. 4. I get this with no port, or port 800 and 8001. The registration then aborts, since we cannot continue without knowing the correct port. Wie hier beschrieben, sollten alle Bedingungen für eine TLS encryption erfüllt sein. Basically i installed checkmk site into Docker then i installed the agent into the desired server, but when i run the command: sudo cmk-agent-ctl register -vv --hostname name --server ip:8000 --site cmk --user user --password pass. e. 6. OS version: TrueNAS SCALE 22. The cmk-agent user was sucessfully created. THaeber • 5 mo. Bulk Consent Manager. service. Then I installed the agent on the server, and registered, and this part finally worked, the server can monitor itself (even if I don’t understand why cmk-agent-ctl register --hostname 127. en. Welcome to the Checkmk User Guide. socket systemctl status cmk-agent-ctl-daemon. Install went fine. 1. CMK version: 2. 1. 1. DOH I forgot I had set a custom port for agent receiver as i had a conflict for 8000 on my docker host. Here is the deep link to the section in the manual:. If I try to register it with the command: cmk-agent-ctl register --detect-proxy --hostname FOO --server bla. 6. cmk-agent-ctl register --hostname app-a. 1. It would be good if after you run the cmk-agent-ctl register you get a positive validation in the command output like OK or Registered! thanks for your support. For Debian remove the cmk-agent and purge the configuration, than reinstall the agent, this purges the xinetd configuration. I had to add the checkmk user again. I am experiencing a problem with registering the agent: CMK version: 2. If there are leftovers from 2. Segmentation fault (core dumped) The same result also with the all needed parameters for the registration. Upon first try, “cmk-agent-ctl register. Now the cmk-agent-ctl-daemon. You can either delete that file or remove xinetd altogether. For this, I’m running following command on client # cmk-agent-ctl register --hostname `hostname -f` --server mon. Welcome to Checkmk. With telnet i can connect to the agent from the OMD server. You can learn how to use the agent here. socket → /lib/systemd/system/check-mk-agent. cme and I’m no longer able to register new hosts with an automation user “cmkautomation” that I created a while ago (with role “agent_registration”). Sie können zwei Checkmk-Appliances. 0p10 Agent socket: operational IP allowlist: any Connection: localhost:8001/cmk UUID: 186f71b9-8d6f-41c6-be44-bb1f7c23ae7b Local: Connection. 0p10 Agent socket: operational IP allowlist: any Connection: localhost:8001/cmk UUID: 186f71b9-8d6f-41c6-be44-bb1f7c23ae7b Local: Connection. Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins) sudo: cmk: command not found. In order to register at a Checkmk site, the agent controller ( cmk-agent-ctl) needs to know, among others, the name of the server where the site is running and a port. monitoring. g. Thank you very much to assist me on this way! system (system) Closed September 26, 2023, 4:01pm 9. This might be a bug. local -i home -U cmkadmin ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both. cme and I’m no longer able to register new hosts with an automation user “cmkautomation” that I created a while ago (with role “agent_registration”). With Checkmk agent connection mode you decide whether the Checkmk agent should work in pull mode or (as in the following image) in push mode. Upon first try, “cmk-agent-ctl register. 0 did not yet use TLS, so port 8000 didn’t need to be exposed back then. it --server 192. slice (loaded active) and check_mk. Dann hast du die Herangehensweise schon gefunden, wenn man die Zertifikate noch nicht im Griff hat. a re-register has the same effect, even with a cmk-agent-ctl delete and a “remove TLS registration”. Anyhow when registering the usual way as I did it. 1. As suggested in another post i read i checked:-that port 8000 is open-omd config show | grep AGENT_RECEIVER show port 8000cmk-agent-ctl register --server cmkserver:443 --trust-cert --site cmksite --user username --password password --hostname monitoringhost On Debian 11 if got the following outputCMK version: 2. ERROR [cmk_agent_ctl] Failed to run as user 'cmk-agent'. When I try to register the agent on the host system with: cmk-agent-ctl register --hostname some_hostname --server 127. Inside the container: root@9529f647cd27:/# omd version OMD - Open Monitoring Distribution Version 2. domain. If you forward port 9800 to 8000 then you also have to use port 9800 in your register command. service: Scheduled restart job, restart counter is at 2. I should have mentioned I have a network device sitting in-between which is presenting a different certificate (the wildcard cert signed by a public CA) and I haven’t changed any CA settings outside the web UI. 234. This is the command we used to register the agent: C:Windowssystem32> "C:Program Files (x86)checkmkservicecmk-agent-ctl. com--site FOO --user BAR -. I am trying to register an agent installed on a Windows Server 2019. The Agent Receiver tells the Agent Controller. exe register --trust-cert -vv” command: [2023-02-10 12:54:18. gierse,. The register command cmk-agent-ctl register often gets confused with the Agent update registration cmk-agent-update register, but these are two different registration types: one for TLS encryption and one for registering automatic updates (Agent Bakery, cee). From its very beginning, monitoring Windows servers has been one of the most important tasks performed by Checkmk. 5. 0 2. 0 or earlier.