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    Troubleshooting Help Requested

    Scheduled Pinned Locked Moved Unsolved IT Discussion
    centosvirtual machineesxitroubleshooting
    44 Posts 13 Posters 3.7k Views
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    • DustinB3403D
      DustinB3403 @IRJ
      last edited by

      @IRJ said in Troubleshooting Help Requested:

      is onboot enabled?

      Yes.

      1 Reply Last reply Reply Quote 0
      • DustinB3403D
        DustinB3403
        last edited by

        This is what I get from the non-working VM.

        yum update
        Loaded plugins: fastestmirror
        Loading mirror speeds from cached hostfile
         * base: mirror.atlanticmetro.net
         * extras: bay.uchicago.edu
         * updates: centos.s.uw.edu
        http://repos-va.psychz.net/centos/7.6.1810/os/x86_64/repodata/repomd.xml: [Errno                                                                                                                                                              14] curl#6 - "Could not resolve host: repos-va.psychz.net; Unknown error"
        Trying other mirror.
        

        It just keeps going through all of the mirrors, obviously.

        I've disabled and turned off yum-cron and have reboot numerous times. So that isn't it. I can ping locally by IP and DNS from the non-working machine.

        travisdh1T 1 Reply Last reply Reply Quote 0
        • DustinB3403D
          DustinB3403
          last edited by

          I guess I'll just restore the VM and see what happens from it.

          1 Reply Last reply Reply Quote 0
          • travisdh1T
            travisdh1 @DustinB3403
            last edited by

            @DustinB3403 said in Troubleshooting Help Requested:

            This is what I get from the non-working VM.

            yum update
            Loaded plugins: fastestmirror
            Loading mirror speeds from cached hostfile

            • base: mirror.atlanticmetro.net
            • extras: bay.uchicago.edu
            • updates: centos.s.uw.edu
              http://repos-va.psychz.net/centos/7.6.1810/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: repos-va.psychz.net; Unknown error"
              Trying other mirror.

            It just keeps going through all of the mirrors, obviously.

            I've disabled and turned off yum-cron and have reboot numerous times. So that isn't it. I can ping locally by IP and DNS from the non-working machine.

            Did I see right that traceroute isn't installed?

            DustinB3403D 1 Reply Last reply Reply Quote 0
            • DustinB3403D
              DustinB3403 @travisdh1
              last edited by

              @travisdh1 yes.

              travisdh1T 1 Reply Last reply Reply Quote 0
              • DustinB3403D
                DustinB3403
                last edited by

                And it isn't required either, as this system has updated fine for months.

                1 Reply Last reply Reply Quote 0
                • travisdh1T
                  travisdh1 @DustinB3403
                  last edited by travisdh1

                  @DustinB3403 said in Troubleshooting Help Requested:

                  @travisdh1 yes.

                  Makes it difficult to see weather there are peering-point issues between you and the mirror sites.

                  edit: Yes, I've seen networks block distribution mirror sites before. So much fun trying to get those fixed.

                  DustinB3403D 1 Reply Last reply Reply Quote 0
                  • DustinB3403D
                    DustinB3403 @travisdh1
                    last edited by

                    @travisdh1 said in Troubleshooting Help Requested:

                    edit: Yes, I've seen networks block distribution mirror sites before. So much fun trying to get those fixed.

                    But on the very same network, just a different host nothing is blocked. I could of course look at the firewall to see if something was changed. But if changes were to be made, I think I would've been made aware.

                    And every mirror is blocked. It's as though this device itself is blocked.

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                    • black3dynamiteB
                      black3dynamite
                      last edited by

                      Try ping -4 google.com
                      It’s probably using ipv6 instead of ipv4

                      DustinB3403D 2 Replies Last reply Reply Quote 1
                      • DustinB3403D
                        DustinB3403 @black3dynamite
                        last edited by

                        @black3dynamite said in Troubleshooting Help Requested:

                        Try ping -4 google.com
                        It’s probably using ipv6 instead of ipv4

                        Will test that in a moment. The restore is going.

                        1 Reply Last reply Reply Quote 0
                        • DustinB3403D
                          DustinB3403 @black3dynamite
                          last edited by

                          @black3dynamite said in Troubleshooting Help Requested:

                          Try ping -4 google.com
                          It’s probably using ipv6 instead of ipv4

                          No change.

                          And the backup from yesterday has no change either. Grr. . . I don't want to rebuild this VM. . . going further back.

                          It isn't mission critical either, just irritating.

                          1 Reply Last reply Reply Quote 0
                          • ObsolesceO
                            Obsolesce
                            last edited by

                            Are you using NetworkManager? If so, turn that shit off.

                            DustinB3403D 1 Reply Last reply Reply Quote 0
                            • ObsolesceO
                              Obsolesce
                              last edited by

                              Try adding 127.0.0.1 to /etc/resolv.conf

                              DustinB3403D 1 Reply Last reply Reply Quote 0
                              • DustinB3403D
                                DustinB3403 @Obsolesce
                                last edited by

                                @Obsolesce said in Troubleshooting Help Requested:

                                Are you using NetworkManager? If so, turn that shit off.

                                Not using NM.

                                1 Reply Last reply Reply Quote 0
                                • DustinB3403D
                                  DustinB3403 @Obsolesce
                                  last edited by

                                  @Obsolesce said in Troubleshooting Help Requested:

                                  Try adding 127.0.0.1 to /etc/resolv.conf

                                  No change with adding the loopback.

                                  M 1 Reply Last reply Reply Quote 0
                                  • M
                                    manxam @DustinB3403
                                    last edited by

                                    @DustinB3403 : The fact that you can ping the gateway/router by name and IP makes me suspect it's the firewall.
                                    AFAIK, there is nothing on a linux box that would allow it to distinguish between LAN and WAN when performing lookups.

                                    scottalanmillerS 1 Reply Last reply Reply Quote 0
                                    • scottalanmillerS
                                      scottalanmiller @manxam
                                      last edited by

                                      @manxam said in Troubleshooting Help Requested:

                                      @DustinB3403 : The fact that you can ping the gateway/router by name and IP makes me suspect it's the firewall.
                                      AFAIK, there is nothing on a linux box that would allow it to distinguish between LAN and WAN when performing lookups.

                                      the firewall, OR the default gateway is messed up. Check the routes on the VM.

                                      DustinB3403D 1 Reply Last reply Reply Quote 1
                                      • DustinB3403D
                                        DustinB3403 @scottalanmiller
                                        last edited by

                                        @scottalanmiller I have 1 route on the VM, and its a mirror image of the route on the working VM, with the exception of the device name, and IP.

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                                        • DustinB3403D
                                          DustinB3403
                                          last edited by

                                          Working
                                          putty_2019-02-22_15-15-43.png

                                          Not Working
                                          putty_2019-02-22_15-15-35.png

                                          M 1 Reply Last reply Reply Quote 0
                                          • M
                                            manxam @DustinB3403
                                            last edited by

                                            @DustinB3403 : Yes, but that doesn't mean the firewall doesn't have a rule (or is a Sonicwall -- see my old post) to block outbound on WAN from that IP.

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