Discuss January 2018

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72 discussions

Identifying Official CentOS AWS AMIs
by Paul Heinlein 02 Jan '18

02 Jan '18

I'm trying to automate identification of CentOS AWS images. It appears that official CentOS AMIs have an OwnerID value of 410186602215, but I'm not sure if that value is transient or specific to one or more AWS regions. Is there a maintainer lurking here that can confirm or deny? Here's the base query I'm testing: aws ec2 describe-images \ --owners 410186602215 \ --output text \ --query 'reverse(sort_by(Images, &CreationDate))[?starts_with(Description, `CentOS Linux 7`)].[ImageId, CreationDate, Description]' -- Paul Heinlein heinlein(a)madboa.com 45°38' N, 122°6' W

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DHCP timeout and mysteriously dropping IP address
by Jason Edgecombe 02 Jan '18

02 Jan '18

Hi everyone, I'me having trouble with a CentOS 7 guest running on a Hyper-V host. For some reason, the CentOS guest randomly drops its IP address. Running "systemctl restart NetworkManager" on the console will restore IP connectivity without a reboot. I think that DHCP is timing out, but I'm not sure what to do about it. Is there a way to tell NetworkManager to keep trying after a timeout? Here are the versions of the kernel and NetworkManager: Kernel: 3.10.0-693.11.1.el7.x86_64 NetworkManager: 1.8.0-11.el7_4.x86_64 Here are some pertinent logs: Dec 23 03:30:26 myhost kernel: hv_utils: Using TimeSync version 3.0 Dec 23 03:30:27 myhost systemd: Time has been changed Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.3750] device (eth0): link connected Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.3762] device (eth0): DHCPv4 lease renewal requested Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.3889] dhcp4 (eth0): canceled DHCP transaction, DHCP client pid 7936 Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.3890] dhcp4 (eth0): state changed bound -> done Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.3899] dhcp4 (eth0): activation: beginning transaction (timeout in 45 seconds) Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.4487] dhcp4 (eth0): dhclient started with pid 33165 Dec 23 03:30:33 myhost dhclient[33165]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x5cb111f1) Dec 23 03:30:33 myhost dhclient[33165]: DHCPACK from xxx.xxx.36.1 (xid=0x5cb111f1) Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5824] dhcp4 (eth0): address xxx.xxx.37.53 Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5825] dhcp4 (eth0): plen 23 (255.255.254.0) Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp4 (eth0): gateway xxx.xxx.36.1 Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp4 (eth0): lease time 7200 Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp4 (eth0): nameserver 'xxx.xxx.0.20' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp4 (eth0): nameserver 'xxx.xxx.0.30' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp4 (eth0): domain name 'example.com' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5826] dhcp (eth0): domain search 'example.com.' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5827] dhcp (eth0): domain search 'foo.example.com.' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5827] dhcp (eth0): domain search 'dyn.example.com.' Dec 23 03:30:33 myhost NetworkManager[788]: <info> [1514017833.5827] dhcp4 (eth0): state changed unknown -> bound Dec 23 03:30:33 myhost dhclient[33165]: bound to xxx.xxx.37.53 -- renewal in 3368 seconds. Dec 23 03:30:33 myhost dbus-daemon: dbus[726]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' Dec 23 03:30:33 myhost dbus[726]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' Dec 23 03:30:33 myhost systemd: Starting Network Manager Script Dispatcher Service... Dec 23 03:30:33 myhost dbus[726]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Dec 23 03:30:33 myhost dbus-daemon: dbus[726]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Dec 23 03:30:33 myhost systemd: Started Network Manager Script Dispatcher Service. Dec 23 03:30:33 myhost nm-dispatcher: req:1 'dhcp4-change' [eth0]: new request (4 scripts) Dec 23 03:30:33 myhost nm-dispatcher: req:1 'dhcp4-change' [eth0]: start running ordered scripts... Dec 23 03:40:42 myhost kernel: hv_utils: Using TimeSync version 3.0 Dec 23 03:40:43 myhost systemd: Time has been changed Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4566] device (eth0): link connected Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4583] device (eth0): DHCPv4 lease renewal requested Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4693] dhcp4 (eth0): canceled DHCP transaction, DHCP client pid 33165 Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4694] dhcp4 (eth0): state changed bound -> done Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4703] dhcp4 (eth0): activation: beginning transaction (timeout in 45 seconds) Dec 23 03:40:49 myhost NetworkManager[788]: <info> [1514018449.4781] dhcp4 (eth0): dhclient started with pid 33440 Dec 23 03:40:49 myhost dhclient[33440]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x2f112c1) Dec 23 03:40:52 myhost dhclient[33440]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x2f112c1) Dec 23 03:40:57 myhost dhclient[33440]: DHCPREQUEST on eth0 to 255.255.255.255 port 67 (xid=0x2f112c1) Dec 23 03:41:02 myhost dhclient[33440]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6 (xid=0xe5feb70) Dec 23 03:41:08 myhost dhclient[33440]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10 (xid=0xe5feb70) Dec 23 03:41:18 myhost dhclient[33440]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 12 (xid=0xe5feb70) Dec 23 03:41:30 myhost dhclient[33440]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 16 (xid=0xe5feb70) Dec 23 03:41:34 myhost NetworkManager[788]: <warn> [1514018494.9605] dhcp4 (eth0): request timed out Dec 23 03:41:34 myhost NetworkManager[788]: <info> [1514018494.9612] dhcp4 (eth0): state changed unknown -> timeout Dec 23 03:41:34 myhost NetworkManager[788]: <info> [1514018494.9713] dhcp4 (eth0): canceled DHCP transaction, DHCP client pid 33440 Dec 23 03:41:34 myhost NetworkManager[788]: <info> [1514018494.9714] dhcp4 (eth0): state changed timeout -> done Thanks, Jason --------------------------------------------------------------------------- Jason Edgecombe | Linux Administrator UNC Charlotte | The William States Lee College of Engineering 9201 University City Blvd. | Charlotte, NC 28223-0001 Phone: 704-687-1943 jwedgeco(a)uncc.edu | http://engr.uncc.edu | Facebook --------------------------------------------------------------------------- If you are not the intended recipient of this transmission or a person responsible for delivering it to the intended recipient, any disclosure, copying, distribution, or other use of any of the information in this transmission is strictly prohibited. If you have received this transmission in error, please notify me immediately by reply e-mail or by telephone at 704-687-1943. Thank you.

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Discuss January 2018