Category Archives: Troubleshooting

Various problems solutions

Redis: Sentinel – bind 0.0.0.0, the localhost issue and the announce-ip option
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10 April 2019

Originally, in a Sentinel’s configs, I have used the bind 0.0.0.0 to make them accessible from external hosts. Because of this when I started rolling out this setup on a real environment faced with an issue when Sentinels could not determine a Master host and other Sentinel hosts. In this post – such an issue… Read More: Redis: Sentinel – bind 0.0.0.0, the localhost issue and the… »

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Redis: Can’t open the log file: Read-only file system
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3 April 2019

Have a new Redis service which has to run alongside with one already existing During starting this new service – it fails with the Can’t open the log file: Read-only file system error, although /var/log and log file itself have correct permissions. The root cause was not very obvious so in this post – its… Read More: Redis: Can’t open the log file: Read-only file system0 (0) »

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Jenkins: your Jenkins data directory is almost full and automated disk cleanup
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27 March 2019

We have a Jenkins instance with a bunch of jobs. After a while – a new warning appeared: Jenkins: your Jenkins data directory /var/lib/jenkins (aka JENKINS_HOME) is almost full Checked disk usage with the ncdu and found few jobs which used really lot of space: [simterm] root@jenkins-production:/data/jenkins# du -h –max-depth 1 jobs/ .. 25G jobs/APITests …… Read More: Jenkins: your Jenkins data directory is almost full and automated… »

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Arch Linux: NVIDIA driver installation for GeForce GTX 1050 Ti
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25 March 2019

The main goal when I was buying a new PC with NVIDIA GeForce GTX 1050 Ti was an ability to play games on Arch Linux without reboots into Windows. For this need to install NVIDIA drivers so Linux will use it instead of nouveau (although I didn’t even try to run any game with nouveau).… Read More: Arch Linux: NVIDIA driver installation for GeForce GTX 1050 Ti0… »

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Jenkins: HTTP full-duplex channel timeout
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15 March 2019

During connection to a Jenkins using its CLI – it finished with an error. Exactly in a console, there was nothing in the output, but after issuing echo $? to display last command’s execution return code – there was the 255 response as I remember – didn’t save it to this post’s draft. The connection… Read More: Jenkins: HTTP full-duplex channel timeout0 (0) »

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Linux: telegram-desktop – no systray icon
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13 March 2019

Have the telegram-desktop installed via pacman on the Arch Linux. After starting – no systray’s icon present and thus can’t see new messages and even can’t exit in a normal way. This issue is not specific for the Arch Linux and happens on any Linux systems. Go to the Google and make search with “telegram linux… Read More: Linux: telegram-desktop – no systray icon0 (0) »

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VirtualBox: Nonexistent host networking interface, name ‘wlp13s0’
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11 March 2019

Have the ~/VirtualBox VMs directory copied from my old laptop to a new PC. Now during VM’s launch – VirtualBox says: Nonexistent host networking interface, name ‘wlp13s0’ (VERR_INTERNAL_ERROR). Result Code: NS_ERROR_FAILURE (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} Check interfaces on the new PC: [simterm] $ ip a s 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue… Read More: VirtualBox: Nonexistent host networking interface, name ‘wlp13s0’0 (0) »

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Prometheus: RTFM blog monitoring set up with Ansible – Grafana, Loki, and promtail
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10 March 2019

After implementing the Loki system on my job’s project – I decided to add it for myself, so see my RTFM blog server’s logs. Also – want to add the node_exporter and alertmanager, to be notified about high disk usage. In this post, I’ll describe the Prometheus, node_exporter, Grafana, Loki, and promtail set up process… Read More: Prometheus: RTFM blog monitoring set up with Ansible – Grafana,… »

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Linux: LVM – pvcreate Device /dev/sdb4 excluded by a filter.
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9 March 2019

During new Linux set up – suddenly got a weird message. It happen just because of my carelessness and haste. Let’s create new partition: [simterm] [root@archiso ~]# pvcreate /dev/sdb4 Device /dev/sdb4 excluded by a filter. [/simterm] Check new partition size: [simterm] [root@archiso ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 476.7M… Read More: Linux: LVM – pvcreate Device /dev/sdb4 excluded by a filter.0… »

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Prometheus: blackbox-exporter probe_http_status_code == 0 and its debug
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6 March 2019

Today I decided to upgrade Grafana to already released version 6.0 and all other Docker images as well. Upgrade was successful – Loki eventually started displaying previously missed log-file names and other tags, just – immediately I got a bunch of CRITICAL alerts in our Slack from the blackbox-exporter which is used to check every… Read More: Prometheus: blackbox-exporter probe_http_status_code == 0 and its debug0 (0) »

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