The configuration file that you posted was mangled - partly by your E-mail
client I guess, and partly by you (there are two single quotes before
''my.host')
However, if I use *exactly* the following configuration file:
global:
smtp_smarthost: 'my.host:25'
smtp_hello: 'my.system'
smtp_from: 'my.adderss'
route:
receiver: test-email-receiver
group_by: [label1, label2]
receivers:
- name: 'test-email-receiver'
email_configs:
- to: '[email protected]'
text: '{{ template "custom.email" . }}'
templates:
- '/etc/alertmanager/templates/custom-email-template.tmpl'
then alertmanager starts just fine:
root@prometheus:~# /opt/alertmanager/alertmanager
--config.file=/tmp/alert.yml
level=info ts=2020-06-06T17:16:00.765Z caller=main.go:231 msg="Starting
Alertmanager" version="(version=0.20.0, branch=HEAD,
revision=f74be0400a6243d10bb53812d6fa408ad71ff32d)"
level=info ts=2020-06-06T17:16:00.766Z caller=main.go:232
build_context="(go=go1.13.5, user=root@00c3106655f8,
date=20191211-14:13:14)"
level=info ts=2020-06-06T17:16:00.770Z caller=cluster.go:161
component=cluster msg="setting advertise address explicitly"
addr=10.12.255.33 port=9094
level=info ts=2020-06-06T17:16:00.777Z caller=cluster.go:623
component=cluster msg="Waiting for gossip to settle..." interval=2s
level=info ts=2020-06-06T17:16:00.871Z caller=coordinator.go:119
component=configuration msg="Loading configuration file" file=/tmp/alert.yml
level=info ts=2020-06-06T17:16:00.875Z caller=coordinator.go:131
component=configuration msg="Completed loading of configuration file"
file=/tmp/alert.yml
level=info ts=2020-06-06T17:16:00.888Z caller=main.go:497 msg=Listening
address=:9093
level=info ts=2020-06-06T17:16:02.777Z caller=cluster.go:648
component=cluster msg="gossip not settled" polls=0 before=0 now=1
elapsed=2.00028059s
level=info ts=2020-06-06T17:16:10.778Z caller=cluster.go:640
component=cluster msg="gossip settled; proceeding" elapsed=10.001491515s
q
^C
level=info ts=2020-06-06T17:16:40.881Z caller=main.go:536 msg="Received
SIGTERM, exiting gracefully..."
root@prometheus:~# /opt/alertmanager/alertmanager --version
alertmanager, version 0.20.0 (branch: HEAD, revision:
f74be0400a6243d10bb53812d6fa408ad71ff32d)
build user: root@00c3106655f8
build date: 20191211-14:13:14
go version: go1.13.5
This is despite the fact that I haven't even created
/etc/alertmanager/templates/custom-email-template.tmpl
Therefore, I can only surmise that the configuration you're testing with is
not the one you posted. Maybe you haven't given the correct command-line
argument to alertmanager to tell it which config file to read, and so it's
reading a different one than the one you think it is.
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