Hi,
I’ve noticed an odd issue with my containers. I’m running a Ubuntu 20.04 container which runs Nginx inside. The nginx config has a proxy_pass set to localhost:8080. Very occasionally when starting the container, Nginx errors that it’s unable to resolve localhost. Restarting the Nginx service resolves this issue and localhost is able to be resolved. Localhost is indeed in /etc/hosts.
I do not have any idea why or how this is happening, I’d appreciate if someone else has an idea to troubleshoot and debug further. For a fix I’ve added restarts to the system unit but I am curious of the root cause here.
LXD Version: 5.0.2
container /etc/hosts
127.0.0.1 localhost.localdomain localhost
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
Container config
architecture: x86_64
config:
boot.autostart: "true"
image.architecture: amd64
image.description: ubuntu 20.04 amd64 (20240107_12:03)
image.os: ubuntu
image.release: focal
image.serial: "20240107_12:03"
image.type: squashfs
image.variant: default
limits.cpu: "6"
limits.memory: 17180MB
snapshots.expiry: 1w
snapshots.schedule: 5 2 * * *
user.user-data: |
#cloud-config
disable_root: false
system_info:
apt_get_wrapper:
command: eatmydata
enabled: False
apt:
preserve_sources_list: true
package_update: true
packages:
- openssh-server
- python3
- python3-pip
- python3-simplejson
- python3-openssl
volatile.base_image: 21c1ae3abf5e90048ece1ebe508e197855f57a7874b031e4d39df72cbb214969
volatile.cloud-init.instance-id: 9e625b08-377f-4288-8420-dc424ccc9941
volatile.eth0.hwaddr: 00:16:3e:7c:26:b6
volatile.idmap.base: "0"
volatile.idmap.current: '[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
volatile.idmap.next: '[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
volatile.last_state.idmap: '[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'
volatile.last_state.power: RUNNING
volatile.uuid: be8160f5-7697-4535-9461-505db494e661
devices:
eth0:
name: eth0
nictype: bridged
parent: br1
type: nic
root:
path: /
pool: default
size: 323GB
type: disk
ephemeral: false
profiles:
- default
- bootstrap-ansible-no-kernel
stateful: false
description: ""
br1 network config
config: {}
description: ""
name: br1
type: bridge
used_by:
...
managed: false
status: ""
locations: []
Nginx error
ystemd[1]: Starting A high performance web server and a reverse proxy server...
ginx[226]: nginx: [emerg] host not found in upstream "localhost" in /etc/nginx/sites-enabled/d>
ginx[226]: nginx: configuration file /etc/nginx/nginx.conf test failed
ystemd[1]: nginx.service: Control process exited, code=exited, status=1/FAILURE
ystemd[1]: nginx.service: Failed with result 'exit-code'.
ystemd[1]: Failed to start A high performance web server and a reverse proxy server.
ystemd[1]: nginx.service: Unit cannot be reloaded because it is inactive.