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grafana/devenv/docker/ha_test/README.md
Brenda Harjala c9e566b156 Docs: Minor edits to the README and several md files (#19238)
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Markdown

# Grafana High Availability (HA) test setup
A set of docker compose services which together creates a Grafana HA test setup with capability of easily
scaling up/down number of Grafana instances.
Included services
* Grafana
* Mysql - Grafana configuration database and session storage
* Prometheus - Monitoring of Grafana and used as data source of provisioned alert rules
* Nginx - Reverse proxy for Grafana and Prometheus. Enables browsing Grafana/Prometheus UI using a hostname
## Prerequisites
### Build grafana docker container
Build a Grafana docker container from current branch and commit and tag it as grafana/grafana:dev.
```bash
$ cd <grafana repo>
$ make build-docker-full
```
### Virtual host names
#### Alternative 1 - Use dnsmasq
```bash
$ sudo apt-get install dnsmasq
$ echo 'address=/loc/127.0.0.1' | sudo tee /etc/dnsmasq.d/dnsmasq-loc.conf > /dev/null
$ sudo /etc/init.d/dnsmasq restart
$ ping whatever.loc
PING whatever.loc (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.076 ms
--- whatever.loc ping statistics ---
1 packet transmitted, 1 received, 0% packet loss, time 1998ms
```
#### Alternative 2 - Manually update /etc/hosts
Update your `/etc/hosts` to be able to access Grafana and/or Prometheus UI using a hostname.
```bash
$ cat /etc/hosts
127.0.0.1 grafana.loc
127.0.0.1 prometheus.loc
```
## Start services
```bash
$ docker-compose up -d
```
Browse
* http://grafana.loc/
* http://prometheus.loc/
Check for any errors
```bash
$ docker-compose logs | grep error
```
### Scale Grafana instances up/down
Scale number of Grafana instances to `<instances>`
```bash
$ docker-compose up --scale grafana=<instances> -d
# for example 3 instances
$ docker-compose up --scale grafana=3 -d
```
## Test alerting
### Create notification channels
Creates default notification channels, if not already exists
```bash
$ ./alerts.sh setup
```
### Slack notifications
Disable
```bash
$ ./alerts.sh slack -d
```
Enable and configure url
```bash
$ ./alerts.sh slack -u https://hooks.slack.com/services/...
```
Enable, configure url and enable reminders
```bash
$ ./alerts.sh slack -u https://hooks.slack.com/services/... -r -e 10m
```
### Provision alert dashboards with alert rules
Provision 1 dashboard/alert rule (default)
```bash
$ ./alerts.sh provision
```
Provision 10 dashboards/alert rules
```bash
$ ./alerts.sh provision -a 10
```
Provision 10 dashboards/alert rules and change condition to `gt > 100`
```bash
$ ./alerts.sh provision -a 10 -c 100
```
### Pause/unpause all alert rules
Pause
```bash
$ ./alerts.sh pause
```
Unpause
```bash
$ ./alerts.sh unpause
```