tools/promtail.sh: add DATAROOT option (#98)

* tools/promatail.sh: add DATAROOT option

Signed-off-by: Xiang Dai <764524258@qq.com>

* ksonnet: support custom data root

Signed-off-by: Xiang Dai <764524258@qq.com>

* Move dataroot setting to $._config.promtail_config.dataroot

* whitespace fix

* Update promtail.libsonnet

production/ksonnet/README.md

@@ -45,10 +45,12 @@ promtail + {
       hostname: 'logs-us-west1.grafana.net',
       username: 'user-id',
       password: 'password',
+      dataroot: '/var/lib/docker',
     },
   },
 }
 ```
+Notice that `dataroot` is your own data root for docker daemon, use `docker info | grep "Root Dir"` to get it.
 
 Then do `ks show loki` to see the manifests that'll be deployed to your cluster.
 Apply them using `ks apply loki`.
@@ -79,13 +81,15 @@ loki + promtail + gateway {
       scheme: 'http',
       hostname: 'gateway.%(namespace)s.svc' % $._config,
       username: 'loki',
-      password: 'password'
+      password: 'password',
+      dataroot: '/var/lib/docker',
     },
     replication_factor: 3,
     consul_replicas: 1,
   },
 }
 ```
+Notice that `dataroot` is your own data root for docker daemon, use `docker info | grep "Root Dir"` to get it.
 
 Do `ks show loki` to see the manifests being deployed to the cluster.
 Finally `ks apply loki` to deploy the server components to your cluster.

production/ksonnet/promtail/promtail.libsonnet

@@ -12,6 +12,7 @@ k {
       password: '',
       scheme: 'https',
       hostname: 'log-us.grafana.net',
+      dataroot: '/var/lib/docker',
     },
 
 
@@ -184,5 +185,5 @@ k {
     daemonSet.mixin.spec.template.spec.withServiceAccount('promtail') +
     $.util.configVolumeMount('promtail', '/etc/promtail') +
     $.util.hostVolumeMount('varlog', '/var/log', '/var/log') +
-    $.util.hostVolumeMount('varlibdockercontainers', '/var/lib/docker/containers', '/var/lib/docker/containers', readOnly=true),
+    $.util.hostVolumeMount('varlibdockercontainers', $._config.promtail_config.dataroot + '/containers', '/var/lib/docker/containers', readOnly=true),
 }

tools/promtail.sh

@@ -4,9 +4,10 @@ INSTANCEID="${1:-}"
 APIKEY="${2:-}"
 INSTANCEURL="${3:-}"
 NAMESPACE="${4:-default}"
+DATAROOT="${5-/var/lib/docker}"
 
-if [ -z "$INSTANCEID" -o -z "$APIKEY" -o -z "$INSTANCEURL" -o -z "$NAMESPACE" ]; then
-    echo "usage: $0 <instanceId> <apiKey> <url> <namespace>"
+if [ -z "$INSTANCEID" -o -z "$APIKEY" -o -z "$INSTANCEURL" -o -z "$NAMESPACE" -o -z "$DATAROOT" ]; then
+    echo "usage: $0 <instanceId> <apiKey> <url> <namespace> <dataroot>"
     exit 1
 fi
 
@@ -134,7 +135,7 @@ spec:
           path: /var/log
         name: varlog
       - hostPath:
-          path: /var/lib/docker/containers
+          path: <dataroot>/containers
         name: varlibdockercontainers
   updateStrategy:
     type: RollingUpdate
@@ -182,3 +183,4 @@ echo "$TEMPLATE" | sed \
   -e "s#<apiKey>#${APIKEY}#" \
   -e "s#<instanceUrl>#${INSTANCEURL}#" \
   -e "s#<namespace>#${NAMESPACE}#"
+  -e "s#<dataroot>#${DATAROOT}#"