Igor-Potapov's questions

I have a local server 192.168.1.10 (I attached DNS record locally to HTTP://inventory.local) In the local network I use this service perfectly.

Today, I decided to connect to the local network via VPN, and unfortunately, I got the error: DNS_PROBE_FINISHED_NXDOMAIN. I add the DNS record to /etc/hosts:

192.168.1.10    http://inventory.local

It does not solve the issue, but I can ping IP 192.168.1.10 and host http://inventory.local. In my case browser can't use this record.

How to configure ubuntu to use a local site via VPN?

1. I have Wifi router TP-Link Archer C7, which configured as Gateway and OpenVPN server: GW 192.168.33.1, Mask 255.255.128.0

2. I have switch with connected 3 devices with static IP: 192.168.1.200, 192.168.1.220 and 192.168.1.230

3. I have a Laptop with Ubuntu 20.04 with next interfaces: Wi-Fi (DHCP): IP 192.168.33.55, Mask 255.255.128.0, GW 192.168.33.1 and Ethernet (Static): IP 192.168.1.230, Mask 255.255.255.0 (connected to switch)

In this case, the laptop is connected to the internet via wi-fi and connected to the switch by ethernet, also all other devices are connected to this switch. The switch doesn't connect to the router.

I can manage 2 subnets from a laptop because it is a local network. Using the router TP-Link feature I generated an OpenVPN file and submitted it to the user. The user successfully got access to my local network 192.168.33.X but unfortunately can't connect to local devices (which connected to switch through my laptop) with another subnet 192.168.1.230.

I add a route in the router settings: Destination IP: 192.168.1.0 (local network of devices) Mask: 255.255.255.0 GW 192.168.33.55 (IP of my Laptop)

Also on the laptop I see route using IP route command:

169.254.0.0/16 dev wlp0s20f3 scope link metric 1000
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 
192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.230 metric 100 
192.168.33.0/25 dev wlp0s20f3 proto kernel scope link src 192.168.33.55 metric 60

Question: How do correctly set up a route, to get access from VPN to another local network?

I have Ubuntu 20.04 and Jenkins 1.3.3 I need to change the local Jenkins port from 8080 to 8888.

I tried to change the config file sudo gedit /etc/default/jenkins in the string

#port for HTTP connector (default 8080; disable with -1)
HTTP_PORT=8888

After restart service: sudo service jenkins start it doesn't affect changes. I still visit jenkins with 8080 port.

Also in this config file I add additional string: JENKINS_ARGS="--httpPort=$HTTP_PORT" but unfortunately after restart service the same - 8080.

I tried to change the address via web interface in the Manage Jenkins next Configure System next change string Jenkins URL to http://0.0.0.0:8888/ and apply and restart service. I visited page http://0.0.0.0:8080/cli/command/who-am-i and have got next features:

java -jar jenkins-cli.jar -s http://0.0.0.0:8888/ -webSocket who-am-i
Reports your credential and permissions.

So changes are saved but doesn't affect. I tried to restart my PC to initial all changes. Can You help me? Any suggestions?

I have Ubuntu 20.04. I decided to enable SELinux. I done only 3 strings successfully and reboot my pc:

1. sudo apt install policycoreutils selinux-utils selinux-basics
2. sudo selinux-activate
3. sudo selinux-config-enforcing

Unfortunately after this commands my Ubuntu doesn't boot. I have next errors:

systemd[1]: Failed to start Journal Service.
Dependency failed for Flush Journal to Persistent Storage

and many other errors:

FAILED Failed to mount Mount unit for logmein-host, revision 206.
Dependency failed for Service for snap application logmein-host.wetty.
Dependency failed for Service for snap application logme in-host.pytty. 
Dependency failed for Service for snap application logmein-host.logmein.

How to repair Ubuntu state? How to disable SELinux to boot Ubuntu normally?

The last time I receive an error in my browser: Your connection was interrupted A network change was detected. ERR_NETWORK_CHANGED Due to suggestions I disabled IP v6 in my wireless connection but it doesn't take effect.

I decided to see all my network interfaces using the command ip addr. It shows more than 20 different interfaces, all of them similar with last digit difference, and I need to delete them:

10: veth3946f08@if9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
link/ether c2:fc:20:6f:cc:3c brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::c0fc:20ff:fe6f:cc3c/64 scope link 
   valid_lft forever preferred_lft forever

So I made the next command to delete it sudo ip link delete veth3946f08@if9 but unfortunately I got the error: Cannot find device "veth3946f08@if9" hmmm. I make next command to see real or virtual devices: sudo lshw -C network and saw those 20 connections like this:

*-network:2
   description: Ethernet interface
   physical id: 5
   logical name: veth3946f08
   serial: c2:fc:20:6f:cc:3c
   size: 10Gbit/s
   capabilities: ethernet physical
   configuration: autonegotiation=off broadcast=yes driver=veth driverversion=1.0 duplex=full link=yes multicast=yes port=twisted pair speed=10Gbit/s

I tried it to down: sudo ip link set veth3946f08@if9 down and got the same error that Cannot find device "veth3946f08@if9"...

So, how can I delete all of the no-used or no-named interfaces or network adapters?

Added: All IP v6 route

it@Notebook-PC:~$ ip -6 route
::1 dev lo proto kernel metric 256 pref medium
fe80::/64 dev vethcffa914 proto kernel metric 256 pref medium
fe80::/64 dev veth3946f08 proto kernel metric 256 pref medium
fe80::/64 dev vetha3b1511 proto kernel metric 256 pref medium
fe80::/64 dev veth169fcac proto kernel metric 256 pref medium
fe80::/64 dev veth837bcaa proto kernel metric 256 pref medium
fe80::/64 dev veth7509ee9 proto kernel metric 256 pref medium
fe80::/64 dev veth42ac8c3 proto kernel metric 256 pref medium
fe80::/64 dev veth20e1334 proto kernel metric 256 pref medium
fe80::/64 dev veth4d2b8eb proto kernel metric 256 pref medium
fe80::/64 dev wlo1 proto kernel metric 256 pref medium

I used Ubuntu 18.04 with LAMP, Python, Dockers, etc. Once, I received a message, that my laptop ready to upgrade, I accepted and the updating process starts. On the 50% of process, I received a message, that something went wrong and Ubuntu stop to upgrade. During rebooting I saw the message:

[FAILED] Failed to start MySQL Community Server.

So I tried to know the status of my MySQL: systemctl status mysql.service and have got result:

     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Sun 2020-11-29 10:46:34 EET; 6h ago

лис 29 10:46:34 it-HP-250-G7-Notebook-PC mysql-systemd-start[1635]: Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ for tips o>
лис 29 10:46:34 it-HP-250-G7-Notebook-PC mysql-systemd-start[1635]: Once the problem is resolved, restart the service.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: mysql.service: Control process exited, code=exited, status=1/FAILURE
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: mysql.service: Failed with result 'exit-code'.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: Failed to start MySQL Community Server.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: mysql.service: Scheduled restart job, restart counter is at 6.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: Stopped MySQL Community Server.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: mysql.service: Start request repeated too quickly.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: mysql.service: Failed with result 'exit-code'.
лис 29 10:46:34 it-HP-250-G7-Notebook-PC systemd[1]: Failed to start MySQL Community Server.

Next I tried to fix all packages: sudo apt-get update, sudo apt-get upgrade but in the final command line see next warning:

2020-11-29T15:12:34.680279Z 0 [ERROR] [MY-000077] [Server] /usr/sbin/mysqld: Error while setting value 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,N
O_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' to 'sql_mode'.
2020-11-29T15:12:34.696826Z 0 [ERROR] [MY-010119] [Server] Aborting
Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ for tips on fixing common upgrade issues.
Once the problem is resolved, run apt-get --fix-broken install to retry.
dpkg: error processing package mysql-server-8.0 (--configure):
 installed mysql-server-8.0 package post-installation script subprocess returned error exit status 1

Next i tried fix all installations: sudo apt-get --fix-broken install, nothing helps me. I do not want to delete MySQL because I have actual DataBaces, it is important for me.

Any suggestions?

I've bought Logitech group for start conference. I try to connect it to HP notebook with Ubuntu 18.04. I connected it correct and on speaker i do not see message, that connection fail - it is good. In the list of device Immediately after connection USB, disappearing all audio devices and all stay grey. When I visit Google Meet site to create conference, the site after approx 1 min say that nothing to connect (any audio devices found). So I need to ubplug Logitech USB and reboot notebook, after it system (notebook) sound appeared.

I wrote to logitech support, but maybe you have any other and faster solutions?