KubraGen Builder: Promtail
kg_promtail is a builder for KubraGen that deploys a Promtail service in Kubernetes.
Promtail is commonly used with Loki.
KubraGen is a Kubernetes YAML generator library that makes it possible to generate configurations using the full power of the Python programming language.
- Website: https://github.com/RangelReale/kg_promtail
- Repository: https://github.com/RangelReale/kg_promtail.git
- Documentation: https://kg_promtail.readthedocs.org/
- PyPI: https://pypi.python.org/pypi/kg_promtail
Example
from kubragen import KubraGen
from kubragen.consts import PROVIDER_GOOGLE, PROVIDERSVC_GOOGLE_GKE
from kubragen.object import Object
from kubragen.option import OptionRoot
from kubragen.options import Options
from kubragen.output import OutputProject, OD_FileTemplate, OutputFile_ShellScript, OutputFile_Kubernetes, \
OutputDriver_Print
from kubragen.provider import Provider
from kg_promtail import PromtailBuilder, PromtailOptions, PromtailConfigFile, PromtailConfigFileOptions, \
PromtailConfigFileExt_Kubernetes
kg = KubraGen(provider=Provider(PROVIDER_GOOGLE, PROVIDERSVC_GOOGLE_GKE), options=Options({
'namespaces': {
'mon': 'app-monitoring',
},
}))
out = OutputProject(kg)
shell_script = OutputFile_ShellScript('create_gke.sh')
out.append(shell_script)
shell_script.append('set -e')
#
# OUTPUTFILE: app-namespace.yaml
#
file = OutputFile_Kubernetes('app-namespace.yaml')
file.append([
Object({
'apiVersion': 'v1',
'kind': 'Namespace',
'metadata': {
'name': 'app-monitoring',
},
}, name='ns-monitoring', source='app', instance='app')
])
out.append(file)
shell_script.append(OD_FileTemplate(f'kubectl apply -f ${{FILE_{file.fileid}}}'))
shell_script.append(f'kubectl config set-context --current --namespace=app-monitoring')
#
# SETUP: promtail
#
promtailconfigfile = PromtailConfigFile(options=PromtailConfigFileOptions({
}), extensions=[PromtailConfigFileExt_Kubernetes()])
promtail_config = PromtailBuilder(kubragen=kg, options=PromtailOptions({
'namespace': OptionRoot('namespaces.mon'),
'basename': 'mypromtail',
'config': {
'promtail_config': promtailconfigfile,
'loki_url': 'http://loki:3100',
},
'kubernetes': {
'resources': {
'daemonset': {
'requests': {
'cpu': '150m',
'memory': '300Mi'
},
'limits': {
'cpu': '300m',
'memory': '450Mi'
},
},
},
}
}))
promtail_config.ensure_build_names(promtail_config.BUILD_ACCESSCONTROL, promtail_config.BUILD_CONFIG,
promtail_config.BUILD_SERVICE)
#
# OUTPUTFILE: promtail-config.yaml
#
file = OutputFile_Kubernetes('promtail-config.yaml')
out.append(file)
file.append(promtail_config.build(promtail_config.BUILD_ACCESSCONTROL, promtail_config.BUILD_CONFIG))
shell_script.append(OD_FileTemplate(f'kubectl apply -f ${{FILE_{file.fileid}}}'))
#
# OUTPUTFILE: promtail.yaml
#
file = OutputFile_Kubernetes('promtail.yaml')
out.append(file)
file.append(promtail_config.build(promtail_config.BUILD_SERVICE))
shell_script.append(OD_FileTemplate(f'kubectl apply -f ${{FILE_{file.fileid}}}'))
#
# Write files
#
out.output(OutputDriver_Print())
# out.output(OutputDriver_Directory('/tmp/build-gke'))Output:
****** BEGIN FILE: 001-app-namespace.yaml ********
apiVersion: v1
kind: Namespace
metadata:
name: app-monitoring
****** END FILE: 001-app-namespace.yaml ********
****** BEGIN FILE: 002-promtail-config.yaml ********
apiVersion: v1
kind: ServiceAccount
metadata:
name: mypromtail
namespace: app-monitoring
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: mypromtail
rules:
- apiGroups: ['']
resources: [nodes, nodes/proxy, services, endpoints, pods]
verbs: [get, watch, list]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: mypromtail
<...more...>
****** END FILE: 002-promtail-config.yaml ********
****** BEGIN FILE: 003-promtail.yaml ********
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: mypromtail
namespace: app-monitoring
labels:
app: mypromtail
spec:
selector:
matchLabels:
app: mypromtail
template:
metadata:
labels:
app: mypromtail
spec:
serviceAccountName: mypromtail
<...more...>
****** END FILE: 003-promtail.yaml ********
****** BEGIN FILE: create_gke.sh ********
#!/bin/bash
set -e
kubectl apply -f 001-app-namespace.yaml
kubectl config set-context --current --namespace=app-monitoring
kubectl apply -f 002-promtail-config.yaml
kubectl apply -f 003-promtail.yaml
****** END FILE: create_gke.sh ********
Credits
based on
Author
Rangel Reale (rangelreale@gmail.com)
