{"action":"created","issue":{"url":"https://api.github.com/repos/munin-monitoring/munin/issues/1086","repository_url":"https://api.github.com/repos/munin-monitoring/munin","labels_url":"https://api.github.com/repos/munin-monitoring/munin/issues/1086/labels{/name}","comments_url":"https://api.github.com/repos/munin-monitoring/munin/issues/1086/comments","events_url":"https://api.github.com/repos/munin-monitoring/munin/issues/1086/events","html_url":"https://github.com/munin-monitoring/munin/issues/1086","id":362189516,"node_id":"MDU6SXNzdWUzNjIxODk1MTY=","number":1086,"title":"RRD files not created, with Unable to create, Invalid step: must be >= 1","user":{"login":"robotpiotr","id":2962356,"node_id":"MDQ6VXNlcjI5NjIzNTY=","avatar_url":"https://avatars1.githubusercontent.com/u/2962356?v=4","gravatar_id":"","url":"https://api.github.com/users/robotpiotr","html_url":"https://github.com/robotpiotr","followers_url":"https://api.github.com/users/robotpiotr/followers","following_url":"https://api.github.com/users/robotpiotr/following{/other_user}","gists_url":"https://api.github.com/users/robotpiotr/gists{/gist_id}","starred_url":"https://api.github.com/users/robotpiotr/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/robotpiotr/subscriptions","organizations_url":"https://api.github.com/users/robotpiotr/orgs","repos_url":"https://api.github.com/users/robotpiotr/repos","events_url":"https://api.github.com/users/robotpiotr/events{/privacy}","received_events_url":"https://api.github.com/users/robotpiotr/received_events","type":"User","site_admin":false},"labels":[{"id":259742801,"node_id":"MDU6TGFiZWwyNTk3NDI4MDE=","url":"https://api.github.com/repos/munin-monitoring/munin/labels/[affects]%202.0-stable","name":"[affects] 2.0-stable","color":"fdfdfd","default":false},{"id":137992669,"node_id":"MDU6TGFiZWwxMzc5OTI2Njk=","url":"https://api.github.com/repos/munin-monitoring/munin/labels/[component]%20master","name":"[component] master","color":"fad8c7","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2018-09-20T13:32:25Z","updated_at":"2018-11-24T08:56:24Z","closed_at":null,"author_association":"NONE","body":"**Describe the bug**\r\nHi All! I have problem to get working munin on Centos with munin-nodes on Ubuntu 18.04 LTS. We monitor dozen of servers with different OS version (Centos 6, Centos 5, Ubuntu 16.04, Ubuntu 18.04). We use munin from system repo, and in case of Centos, from EPEL library (currently 2.0.40).\r\n\r\nI run into problem with data from munin-nodes on three servers on Ubuntu 18.04. They return something that looks like correct data while debugin through 'nc', but graphs are broken (png files missing), as there  is no RRD files for that hosts. Process fails with \"Invalid step: must be >= 1\" message. Lines from munin-update.log are presented below. \r\n\r\n**To Reproduce**\r\nI see same behaviour on all 3 hosts running munin-node on Ubuntu 18.04. Monitoring works well for Ubuntu 16.04.5 LTS, munin-node v2.0.25-2ubuntu0.16.04.3\r\n\r\n**Expected behavior**\r\nRRD files and png graphs should be created.\r\n\r\n**Logs from munin server**\r\n2018/09/20 07:50:15 [INFO] creating rrd-file for memory->mapped: '/var/lib/munin/***/***-memory-mapped-g.rrd'\r\n2018/09/20 07:50:15 [ERROR] Unable to create '/var/lib/munin/***/****-memory-mapped-g.rrd': Invalid step: must be >= 1\r\n2018/09/20 07:50:15 [ERROR] In RRD: Error updating /var/lib/munin/***/***-memory-mapped-g.rrd: opening '/var/lib/munin/***/***-memory-mapped-g.rrd': No such file or directory\r\n\r\nSame logs for all other plugins, no RRD file is created for those hosts.\r\n\r\n**Output from nc**\r\n**Output from nc from working made remotly from munin server:**\r\nnc 10.****.72 4949\r\n$ munin node at **working host**\r\nlist\r\napc_nis cpu df df_inode entropy forks fw_conntrack fw_forwarded_local fw_packets if_err_eth0 if_err_eth1 if_err_eth2 if_err_eth3 if_eth0 if_eth1 if_eth2 if_eth3 interrupts irqstats load memory netstat ntp_kernel_err ntp_kernel_pll_freq ntp_kernel_pll_off ntp_offset ntp_states open_files open_inodes postfix_mailqueue postfix_mailvolume proc_pri processes swap threads uptime users vmstat\r\nfetch df\r\n_dev_sda3.value 88.5644079188055\r\n_dev_sda1.value 68.6302926671602\r\n_dev_sdb1.value 56.3586025807507\r\n_dev_sdc1.value 43.7771068613263\r\n.\r\nfetch cpu\r\nuser.value 31052797061\r\nnice.value 3774512937\r\nsystem.value 6626055813\r\nidle.value 172635960518\r\niowait.value 377503078\r\nirq.value 101424\r\nsoftirq.value 486065553\r\nsteal.value 0\r\nguest.value 0\r\n\r\n** Output from nc from defunct made remotly from munin server:**\r\nnc 147.****.187 4949\r\n$ munin node at **broken host**\r\nlist\r\nacpi cpu df df_inode entropy forks fw_packets http_loadtime if_eno1 if_eno2 if_err_eno1 if_err_eno2 interrupts ip_** irqstats load memory munin_stats netstat open_files open_inodes postfix_mailqueue postfix_mailvolume proc_pri processes smart_nvme0n1 swap threads uptime users vmstat\r\nfetch df\r\n_run.value 0.0772152427062899\r\n_dev_md3.value 19.4214452882412\r\n_dev_shm.value 0\r\n_run_lock.value 0\r\n_sys_fs_cgroup.value 0\r\n_dev_md2.value 17.2861865992328\r\n_dev_nvme0n1p1.value 0.000765948972479453\r\n.\r\nfetch cpu\r\nuser.value 37830\r\nnice.value 526\r\nsystem.value 30900\r\nidle.value 69936532\r\niowait.value 1620\r\nirq.value 0\r\nsoftirq.value 748\r\nsteal.value 0\r\nguest.value 0\r\n\r\n**Logs from munin-node**\r\n2018/09/20-07:45:03 CONNECT TCP Peer: \"[***.34]:41620\" Local: \"[***.52]:4949\"\r\n2018/09/20-07:50:03 CONNECT TCP Peer: \"[***.34]:60252\" Local: \"[***.52]:4949\"\r\nNo other error messages etc.\r\n\r\n\r\n**Versions**\r\n - munin server - munin 2.0.40-2.el6 on Centos6.10 Final\r\n - munin node - munin 2.0.37-1ubuntu0.1 on Ubuntu 18.04.1 LTS (3 separate servers)\r\n\r\n**Additional context**\r\n\r\n- I tried debug hints from munin website and what I could find in google, without success.\r\n- state-nodename.storable files are created, tried to delete them.\r\n- Tried to change configuration on both munin server and nodes.\r\n"},"comment":{"url":"https://api.github.com/repos/munin-monitoring/munin/issues/comments/441353326","html_url":"https://github.com/munin-monitoring/munin/issues/1086#issuecomment-441353326","issue_url":"https://api.github.com/repos/munin-monitoring/munin/issues/1086","id":441353326,"node_id":"MDEyOklzc3VlQ29tbWVudDQ0MTM1MzMyNg==","user":{"login":"steveschnepp","id":447240,"node_id":"MDQ6VXNlcjQ0NzI0MA==","avatar_url":"https://avatars3.githubusercontent.com/u/447240?v=4","gravatar_id":"","url":"https://api.github.com/users/steveschnepp","html_url":"https://github.com/steveschnepp","followers_url":"https://api.github.com/users/steveschnepp/followers","following_url":"https://api.github.com/users/steveschnepp/following{/other_user}","gists_url":"https://api.github.com/users/steveschnepp/gists{/gist_id}","starred_url":"https://api.github.com/users/steveschnepp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/steveschnepp/subscriptions","organizations_url":"https://api.github.com/users/steveschnepp/orgs","repos_url":"https://api.github.com/users/steveschnepp/repos","events_url":"https://api.github.com/users/steveschnepp/events{/privacy}","received_events_url":"https://api.github.com/users/steveschnepp/received_events","type":"User","site_admin":false},"created_at":"2018-11-24T08:56:24Z","updated_at":"2018-11-24T08:56:24Z","author_association":"MEMBER","body":"The fact that you redacted the logs doesn't help. Could you replace the hostname with good.example.com & bad.example.com, along with the IP :\r\n192.168.1.1xx for good nodes\r\n192.168.1.2xx for bad nodes\r\n\r\nAlso, could you send us the output of a config run?\r\n"}}
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