Services not unregistered from Consul #17079
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|
Here is a full log of a zobie alloc |
|
I updated to nomad 1.5.5 but this bug stays. |
suikast42
pushed a commit
to suikast42/nomadder
that referenced
this issue
May 6, 2023
But with open issue hashicorp/nomad#17079
|
Ok. I have put in a little effort to get to the bottom of it. I enable the drain_on_shutdown {
deadline = "2m"
force = false
ignore_system_jobs = true
}But that's dont make the situation better. My epectation is that the My second approach is to call a script over systemd Stop hook. nomad_node_drain.sh #!/bin/bash
if [ ! -f "/home/{{ansible_user}}/notdrain" ] ; then nomad node drain -enable -self -deadline "2m" -m "Node shutdown" -yes -address=https://localhost:4646 -ca-cert=/usr/local/share/ca-certificates/cloudlocal/cluster-ca-bundle.pem -client-cert=/etc/opt/certs/nomad/nomad.pem -client-key=/etc/opt/certs/nomad/nomad-key.pem;fiWith that approch I have never seen the dead allocations. But I must start the master node first. Otherwise the issue is the same. The approach to drain the node over script comes with the caveat that the node is not eligable after boot. my workarround for make the node eligable again is described here. |
|
@suikast42 still the wrong issue, I think. Please pay attention to where you're posting. |
IMHO not. This solves my problem particularly. Which topic are you suggest ? |
|
It is interesting in those logs that we see (reverse chronological) with nothing following the @suikast42 any chance you can produce a goroutine dump of the Nomad process when one of them gets into this state? And can you provide as much of a real job spec as you can? |
If you tell me how. Sure ✌ |
|
You can just use For the goroutine dump, just find the The standard out/err logs of the Nomad client should then contain a whole bunch of goroutine stack trace information. That should at least help us know if a hook is stuck waiting on something. |
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"ChangeSignal": "",
"DestPath": "local/nats.conf",
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}
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},
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"GRPCService": "",
"GRPCUseTLS": false,
"Header": null,
"InitialStatus": "",
"Interval": 10000000000,
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"Timeout": 2000000000,
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}
],
"Connect": null,
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},
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},
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"PortLabel": "server",
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"Timeout": 2000000000,
"Type": "http"
}
],
"Connect": null,
"EnableTagOverride": false,
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"Name": "grafana-agent-ready",
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}
],
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"Tasks": [
{
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"Config": {
"labels": [
{
"com.github.logunifier.application.version": "0.33.1",
"com.github.logunifier.application.name": "grafana_agent",
"com.github.logunifier.application.pattern.key": "logfmt"
}
],
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],
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"-server.http.address",
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],
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},
"Constraints": null,
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"MaxFileSizeMB": 10,
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},
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"Cores": 0,
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"MemoryMB": 64,
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},
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- ingress.cloud.private:8081\n # grab all metric endpoints with stadanrd /metrics endpoint\n - job_name: \"integrations/consul_sd\"\n consul_sd_configs:\n - server: \"consul.service.consul:8501\"\n tags: [\"prometheus\"]\n tls_config:\n insecure_skip_verify: true\n ca_file: \"/certs/ca/ca.crt\"\n cert_file: \"/certs/consul/consul.pem\"\n key_file: \"/certs/consul/consul-key.pem\"\n datacenter: \"nomadder1\"\n scheme: https\n relabel_configs:\n - source_labels: [__meta_consul_node]\n target_label: instance\n - source_labels: [__meta_consul_service]\n target_label: service\n# - source_labels: [__meta_consul_tags]\n# separator: ','\n# regex: 'prometheus:([^=]+)=([^,]+)'\n# target_label: '$${1}'\n# replacement: '$${2}'\n
- source_labels: [__meta_consul_tags]\n separator: ','\n regex: '.*,prometheus:server_id=([^,]+),.*'\n target_label: 'server_id'\n replacement: '$${1}'\n - source_labels: [__meta_consul_tags]\n separator: ','\n regex: '.*,prometheus:version=([^,]+),.*'\n target_label: 'version'\n replacement: '$${1}'\n - source_labels: ['__meta_consul_tags']\n target_label: 'labels'\n regex: '(.+)'\n replacement: '$${1}'\n action: 'keep'\n # - action: replace\n # replacement: '1'\n #
target_label: 'test'\n metric_relabel_configs:\n - action: labeldrop\n
regex: 'exported_.*'\n\n\n - job_name: \"integrations/consul_sd_minio\"\n metrics_path: \"/minio/v2/metrics/cluster\"\n consul_sd_configs:\n - server: \"consul.service.consul:8501\"\n tags: [\"prometheus_minio\"]\n tls_config:\n
insecure_skip_verify: true\n ca_file: \"/certs/ca/ca.crt\"\n cert_file: \"/certs/consul/consul.pem\"\n key_file: \"/certs/consul/consul-key.pem\"\n
datacenter: \"nomadder1\"\n scheme: https\n relabel_configs:\n - source_labels: [__meta_consul_node]\n target_label: instance\n - source_labels: [__meta_consul_service]\n target_label: service\n# - source_labels: [__meta_consul_tags]\n# separator: ','\n# regex: 'prometheus:([^=]+)=([^,]+)'\n# target_label: '$${1}'\n# replacement: '$${2}'\n - source_labels: [__meta_consul_tags]\n separator: ','\n regex: '.*,prometheus:server=([^,]+),.*'\n target_label: 'server'\n replacement: '$${1}'\n - source_labels: [__meta_consul_tags]\n separator: ','\n
regex: '.*,prometheus:version=([^,]+),.*'\n target_label: 'version'\n replacement: '$${1}'\n - source_labels: ['__meta_consul_tags']\n target_label: 'labels'\n regex: '(.+)'\n replacement: '$${1}'\n action: 'keep'\n# - action: replace\n# replacement: '38'\n# target_label: 'test'\n metric_relabel_configs:\n - action: labeldrop\n regex: 'exported_.*'",
"Envvars": false,
"ErrMissingKey": false,
"Gid": null,
"LeftDelim": "++",
"Perms": "0644",
"RightDelim": "++",
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"Splay": 5000000000,
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}
],
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{
"Destination": "/data/wal",
"PropagationMode": "private",
"ReadOnly": false,
"Volume": "stack_observability_grafana_agent_volume"
},
{
"Destination": "/certs/ca",
"PropagationMode": "private",
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"Volume": "ca_certs"
},
{
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}
]
}
],
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},
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"Name": "cert_consul",
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"Source": "cert_consul",
"Type": "host"
},
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"Name": "stack_observability_grafana_agent_volume",
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"Type": "host"
},
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"Type": "host"
}
}
},
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}
],
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},
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},
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"HealthyDeadline": 300000000000,
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},
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{
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{
"HostNetwork": "default",
"Label": "health",
"To": 3000,
"Value": 0
}
],
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}
],
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},
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"Mode": "fail"
},
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{
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},
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}
],
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}
],
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{
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"Config": {
"labels": [
{
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"com.github.logunifier.application.pattern.key": "tslevelmsg",
"com.github.logunifier.application.strip.ansi": "true",
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}
],
"ports": [
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],
"args": [
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"debug",
"-natsServers",
"nats.service.consul:4222",
"-lokiServers",
"loki.service.consul:9005"
],
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},
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},
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},
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},
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}
],
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},
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}
],
"Type": "service",
"Update": {
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"HealthCheck": "",
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},
"VaultNamespace": "",
"VaultToken": "",
"Version": 0
}
} |
|
And here is the log |
|
@suikast42 After upgrading to 1.5.5 and restarting all nodes, I can see that zombie services get cleared from Consul. After running my ZooKeeper job for a while, the problem seems to come back. Like you, I also see a lot of unregistered services even after the job is stopped.
There are actually only three ZK instances, but there are 60++ instances there. This results in DNS service discovery giving away wrong IP addresses to services that no longer exist, causing services to fail. |
|
FYI. I have the same issue. After doing It seems there is some bug where nomad does not inform consul to deregister. Very frustrating. |
My obeservation is that the start and stop order of the cluster is important. Shutdown
Boot
If I don't respect this order then the "zombies" comes back. |
|
@suikast42 (or others), any chance you can turn on TRACE level logging on the Nomad client, and send those? @gulducat and I have each spent a few hours trying to reproduce the symptoms here but neither of us have been able to. The extra verbose logging may help us understand what we need for a reproduction. |
|
I'm also seeing this new behavior in 1.5.5 after upgrading from 1.4.5. Lots of dead zombie registrations left in Consul. |
For sure. EDIT: |
|
To fill in some of the missing details from my earlier post. Currently deployed into our testing environment: Monitoring our environment, trying to catch it in the act to get relevant logs, but very much the same problem: Not visible from Nomad. 
These are running in an ASG as EC2 spot instances. Terminating the EC2 instance(s) with the zombie instances gets rid of the zombie registrations, however, given time they will return, not necessarily to the same service. |
|
Can confirm the same |
|
For me at least, stopping the affected jobs in Nomad does not deregister the zombie instances from Consul, only the instances Nomad lists within the job's allocations are deregistered. |
What about drain node restart nomad and elig the node again ? |
|
The pattern I'm seeing for zombie instances in Consul is a task failing it's health check, going into "fail" mode and nomad reallocating the task group. The failed tasks are never culled from Consul. Important to note, this doesn't happen 100% of the time. Some additional info: After upgrading to Consul 1.14.x, I had to add this config to Nomad clients to get Connect sidecars working again, otherwise the Connect sidecars would fail to communicate with Consul over gRPC (probably unrelated, but thought I would mention it anyway): consul {
grpc_address = "127.0.0.1:8503"
grpc_ca_file = "/opt/consul/tls/ca-cert.pem"
# ...
} |
There is some chanages in grpc communication. I am at consul 1.15.2. This issues does not relate to consul. I think the issue is on nomad side. You can delete all pssing services fron consul but nomad registers the zombies again. |
shoenig
added a commit
that referenced
this issue
May 15, 2023
This PR fixes a bug where issuing a restart to a terminal allocation would cause the allocation to run its hooks anyway. This was particularly apparent with group_service_hook who would then register services but then never deregister them - as the allocation would be effectively in a "zombie" state where it is prepped to run tasks but never will. Fixes #17079 Fixes #16238 Fixes #14618
shoenig
added a commit
that referenced
this issue
May 15, 2023
This PR fixes a bug where issuing a restart to a terminal allocation would cause the allocation to run its hooks anyway. This was particularly apparent with group_service_hook who would then register services but then never deregister them - as the allocation would be effectively in a "zombie" state where it is prepped to run tasks but never will. Fixes #17079 Fixes #16238 Fixes #14618
|
@Artanicus at the moment the most helpful thing would be for folks to build and run this branch of Nomad as their Client on an affected node, to see if it helps. No need to update servers. This is the 1.5.5 release but with one extra commit (279061f) The full contributing guide, but basically building Nomad is |
|
Hello! 👋 We've been seeing this issue as well. It is consistently reproducible by doing the following:
A reliable way to clean up Consul is by restarting the Nomad agent with the rogue service. |
|
ACK, doing some ambient testing now with a couple of nodes. Doing a Also did some active tests with a slightly modified job that doesn't require raw-exec, I unfortunately am not seeing it having fixed the issue, with the caveat that it repeats for me just from the job's failure / it's own retry scheduling logic without any manual restarts of failed allocs needed. repro job: http.nomadjob "http" {
type = "service"
group "group" {
network {
mode = "host"
port "http" {}
}
count = 5
spread {
attribute = "${node.unique.name}"
}
volume "httproot" {
type = "host"
source = "repro"
read_only = "true"
}
service {
name = "myhttp"
port = "http"
check {
name = "c1"
type = "http"
port = "http"
path = "/hi.txt"
interval = "5s"
timeout = "1s"
check_restart {
limit = 3
grace = "30s"
}
}
}
restart {
attempts = 1
delay = "10s"
mode = "fail"
}
task "python" {
driver = "exec"
volume_mount {
volume = "httproot"
destination = "/srv"
read_only = true
}
config {
command = "python3"
args = ["-m", "http.server", "${NOMAD_PORT_http}", "--directory", "/srv"]
}
resources {
cpu = 10
memory = 64
}
}
}
}
Once I got the allocs running smoothly (more on that further down), here's some tests: case1: Making one node with 1.5.5 (
|
|
Thank you @Artanicus that is very helpful. We might ask you to run another binary in the near future, with a lot more trace logging statements if we still can't figure out what's going on. I've genuinely put 20 or so hours into trying to create a reproduction beyond the If you can, could you try to reproduce again the simplest job possible (count = 1, constraint on the node with a |
|
Here's an attempt at a more hermetic and simple repro with a standlone vagrant dev agent.
VagrantfileVagrant.configure("2") do |config|
config.vm.box = "generic/debian11"
config.vm.network "private_network", ip: "192.168.56.10"
config.vm.synced_folder ".", "/local"
config.vm.provision "shell", inline: <<-SHELL
install /local/nomad /usr/bin/nomad
SHELL
endVersion details:
http.nomadjob "http" {
type = "service"
group "group" {
network {
mode = "host"
port "http" {}
}
count = 1
service {
name = "myhttp"
port = "http"
provider = "nomad"
check {
name = "c1"
type = "http"
port = "http"
path = "/hi.txt"
interval = "5s"
timeout = "1s"
check_restart {
limit = 3
grace = "30s"
}
}
}
restart {
attempts = 1
delay = "10s"
mode = "fail"
}
task "python" {
driver = "raw_exec"
config {
command = "python3"
args = ["-m", "http.server", "${NOMAD_PORT_http}", "--directory", "/tmp"]
}
resources {
cpu = 10
memory = 64
}
}
}
}At first I let it run for a good while without
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That true if you use dynamic port binding. If you do healthcheck on static port than the situation is the worst secenario. the helathcheck is ok but the lb delegates to a dead alloc |
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Here's an even simpler repro, this time starting from a healthy state. Same Vagrantfile, same agent setup. After removing After Even after a If I perform manual service deletes: %> nomad service info -verbose myhttp
ID = _nomad-task-6200cf76-f53e-ed05-511d-e99f4b805c67-group-group-myhttp-http
Service Name = myhttp
Namespace = default
Job ID = http
Alloc ID = 6200cf76-f53e-ed05-511d-e99f4b805c67
Node ID = 9c8d38ff-89c2-e00e-9817-e3e632e637f1
Datacenter = dc1
Address = 127.0.0.1:30086
Tags = []
ID = _nomad-task-843ca52a-1445-c0ca-50e8-e2ffbc96d522-group-group-myhttp-http
Service Name = myhttp
Namespace = default
Job ID = http
Alloc ID = 843ca52a-1445-c0ca-50e8-e2ffbc96d522
Node ID = 9c8d38ff-89c2-e00e-9817-e3e632e637f1
Datacenter = dc1
Address = 127.0.0.1:23706
Tags = []
%> nomad service delete myhttp _nomad-task-843ca52a-1445-c0ca-50e8-e2ffbc96d522-group-group-myhttp-http
Successfully deleted service registrationThe delete does seem to stick, unlike what we were seeing on the Consul side where they got re-created. Even after deleting both service entries, there's still constant log spam though of Full log: |
This was referenced May 16, 2023
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Thanks again @Artanicus, I think we understand what happened now - this bug was originally fixed in 889c5aa0f7 and intended to be backported to Unfortunately something in our pipeline lost/forgot/ignored the If you could try to reproduce again using branch manual-backport-889c5aa0f7, it should hopefully just be fixed. |
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The branch manual-backport-889c5aa0f7 doesn't seem to exist anymore but since it seems like this made it into release/1.5.x I'll try with that.
So it's at least a significant step in a good direction. With the consul service provider I imagine the transient failing services are registered but since they're failing health checks, won't affect downstream loadbalancing. With built-in nomad services it's a bit more iffy since there seems to be no distinction between healthy and unhealthy services, but that I believe is a wholly separate bug/feature to debate and not in scope here. :-) State snapshot for posterity: Full agent log: |
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Thanks again for the testing @Artanicus! We're planning to cut a bugfix release on Monday for this and a few other issues. |
Indeed, Nomad's built-in services actually do contain health check information, but the result of those healchecks is currently only stored on the Client that executed the check and are used for passing/failing deployments, rather than LB availability. You can view their status per-allocation with |
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It seems that v 1.5.6 solves that. I am closing this issue. |
This was referenced May 24, 2023
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For some reason, issue still exists for me after upgrade to 1.6.1 on server and 1.5.6 on clients :( . |
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The issue #16616 is marked as solved. But I have testest with nomad 1.5.1 - 1.5.4 In all the version the same issue is present
Dead allow with diffrent port as previous alloc
Dead allow with same port as previous alloc
If I run the script below the dead allocs which are unhealthy dissaperas from consul but registred again by nomad after few seconds.
EDIT: I stopped the job with nomad job stop --purge event then nomad registers all the dead allocs
All allocs not present after purge the job
Nomad tries to check dead alloc
Edit 2:
Restarting the nomad service on the worker after boot is a workarround but definity not for production.
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