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@slackpad
slackpad / stack.txt
Created Nov 19, 2017
Full stack dump for hashicorp/consul issue #3700
View stack.txt
goroutine profile: total 1272
1131 @ 0x42d6ec 0x42d7de 0x43ed74 0x43e999 0x473b79 0xa287a1 0xf2a44f 0xf2f72d 0xf78b28 0xf72c65 0xf71685 0x684dc4 0x686580 0x687af4 0x683c9d 0x45ce61
# 0x43e998 sync.runtime_Semacquire+0x38 /goroot/src/runtime/sema.go:56
# 0x473b78 sync.(*RWMutex).RLock+0x48 /goroot/src/sync/rwmutex.go:50
# 0xa287a0 github.com/hashicorp/consul/agent/local.(*State).Stats+0x50 /gopath/src/github.com/hashicorp/consul/agent/local/state.go:567
# 0xf2a44e github.com/hashicorp/consul/agent.(*Agent).Stats+0x21e /gopath/src/github.com/hashicorp/consul/agent/agent.go:2049
# 0xf2f72c github.com/hashicorp/consul/agent.(*HTTPServer).AgentSelf+0x3ac /gopath/src/github.com/hashicorp/consul/agent/agent_endpoint.go:75
# 0xf78b27 github.com/hashicorp/consul/agent.(*HTTPServer).AgentSelf-fm+0x47 /gopath/src/github.com/hashicorp/consul/agent/http.go:101
# 0xf72c64 github.com/hashicorp/consul/agent.(*HTTPServer).wrap.func1+0x664 /gopath/src/github.com/hashicorp/consul/agent/http.go:272
# 0xf71684 githu
@slackpad
slackpad / setrlimit.c
Created Nov 19, 2017
Increase fd rlimit for pid 18048
View setrlimit.c
#include <stdlib.h>
#include <sys/resource.h>
int main() {
struct rlimit limit;
limit.rlim_cur = 4096;
limit.rlim_max = 4096;
int ret;
ret = prlimit(18048, RLIMIT_NOFILE, &limit, NULL);
@slackpad
slackpad / bootstrap.md
Last active Jul 18, 2019
Bootstrapping Consul Servers with Version 8 ACLs Enabled (v0.8.1)
View bootstrap.md
@slackpad
slackpad / main.go
Created Feb 24, 2017
Consul ephemeral key example
View main.go
package main
import (
"log"
"github.com/hashicorp/consul/api"
)
func main() {
client, err := api.NewClient(api.DefaultConfig())
View panic.txt
panic: in txn 802578 node leaf channel closed in 0
goroutine 52 [running]:
panic(0xee1140, 0xc454d24f40)
/usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/hashicorp/consul/vendor/github.com/hashicorp/go-immutable-radix.(*Txn).writeNode(0xc4533a4320, 0xc44eede460, 0xc42038d401, 0x1)
/root/go/src/github.com/hashicorp/consul/vendor/github.com/hashicorp/go-immutable-radix/iradix.go:164 +0x5cb
github.com/hashicorp/consul/vendor/github.com/hashicorp/go-immutable-radix.(*Txn).delete(0xc4533a4320, 0xc44eede4b0, 0xc44eede460, 0xc454d24ecf, 0x0, 0x1, 0x1, 0x1)
/root/go/src/github.com/hashicorp/consul/vendor/github.com/hashicorp/go-immutable-radix/iradix.go:302 +0x169
github.com/hashicorp/consul/vendor/github.com/hashicorp/go-immutable-radix.(*Txn).delete(0xc4533a4320, 0xc4533ddcc0, 0xc44eede4b0, 0xc454d24ecc, 0x3, 0x4, 0x1, 0x8)
@slackpad
slackpad / consul-dns-log.patch
Created Dec 19, 2016
Simple patch to add extra TRACE level logging for failed requests
View consul-dns-log.patch
diff --git a/command/agent/dns.go b/command/agent/dns.go
index 7f373cd4..9fa78b66 100644
--- a/command/agent/dns.go
+++ b/command/agent/dns.go
@@ -270,6 +270,9 @@ func (d *DNSServer) handleQuery(resp dns.ResponseWriter, req *dns.Msg) {
if err := resp.WriteMsg(m); err != nil {
d.logger.Printf("[WARN] dns: failed to respond: %v", err)
}
+ if m.MsgHdr.Rcode != 0 {
+ d.logger.Printf("[TRACE] dns: request for %v failed: rcode=%s", q, dns.RcodeToString[m.MsgHdr.Rcode])
View stats.json
{
"Config": {
"DevMode": true,
"Bootstrap": false,
"BootstrapExpect": 0,
"Server": true,
"Datacenter": "dc1",
"DataDir": "",
"DNSRecursor": "",
"DNSRecursors": [],
View wildcard.json
{
"Name": "",
"Template": {
"Type": "name_prefix_match"
},
"Service": {
"Service": "${name.full}",
"Failover": {
"NearestN": 3
}
@slackpad
slackpad / dead_nodes.md
Last active Mar 23, 2016
A bare-bones dead node notification system for Consul
View dead_nodes.md

Here's a basic watch script that will look through the output for serfHealth checks in the critical state. The serfHealth check is a built-in check added by Consul that keeps track of the health of a node. When this watch handler fires, it will get the JSON body of the health endpoint passed to it over stdin.

#!/bin/sh
for node in $(jq '.[] | select(.CheckID=="serfHealth" and .Status=="critical") | .Node' -); do
    echo "$node is dead"
View dns.md
dig @127.0.0.1 -p8600 nope.node.consul

; <<>> DiG 9.8.3-P1 <<>> @127.0.0.1 -p8600 nope.node.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 14084
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available
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