Switch from fluentd to fluentbit for log forwarding (#1086)

This removes fluentd in favor of using fluentbit, which is lighter (in
memory usage) and seems to be more actively maintained.

Fluentbit's config file format is different from fluentd's.  It also
doesn't support the same record modification stuff that fluentd
supports, so we have to change the influxdb query slightly.  This
means that after an upgrade, the new CLI may won't work for querying older 
logs.  Hopefully, this slight breakage is acceptable; if users 
really need older logs they can use the older CLI.

charts/fission-all/templates/fluentbit.yaml

@@ -1,15 +1,21 @@
-# Fluentd deployment for Fission
+# Fluentbit deployment for Fission
 #
 # Requires:
 # - service account: fission-svc
 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: {{ .Release.Name }}-fission-fluentd
+  name: {{ .Release.Name }}-fission-fluentbit
 data:
-{{- if .Files.Get "config/fluentd.conf" }}
-  td-agent.conf: |
-{{ .Files.Get "config/fluentd.conf" | indent 3 }}
+{{- if .Files.Get "config/fluentbit.conf" }}
+  fluentbit.conf: |
+{{ .Files.Get "config/fluentbit.conf" | indent 3 }}
+{{ else }}
+{{ fail "invalid chart" }}
+{{- end }}
+{{- if .Files.Get "config/parsers.conf" }}
+  parsers.conf: |
+{{ .Files.Get "config/parsers.conf" | indent 3 }}
 {{ else }}
 {{ fail "invalid chart" }}
 {{- end }}
@@ -27,9 +33,29 @@ spec:
         svc: logger
     spec:
       containers:
-        - name: fluentd
+        - name: logger
+          image: "{{ .Values.repository }}/{{ .Values.image }}:{{ .Values.imageTag }}"
+          imagePullPolicy: IfNotPresent
+          env:
+            - name: NODE_NAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
+          command: ["/fission-bundle"]
+          args: ["--logger"]
+          volumeMounts:
+            - name: container-log
+              mountPath: /var/log/
+              readOnly: false
+            - name: docker-log
+              mountPath: /var/lib/docker/containers
+              readOnly: true
+        - name: fluentbit
           image: "{{ .Values.logger.fluentdImageRepository }}/{{ .Values.logger.fluentdImage }}:{{ .Values.logger.fluentdImageTag }}"
           imagePullPolicy: {{ .Values.pullPolicy }}
+          # CMD ["/fluent-bit/bin/fluent-bit", "-c", "/fluent-bit/etc/fluent-bit.conf"]
+          command: ["/fluent-bit/bin/fluent-bit", "-c", "/fluent-bit/etc/fluentbit.conf"]
           env:
             - name: INFLUXDB_ADDRESS
               value: influxdb
@@ -47,8 +73,8 @@ spec:
                 secretKeyRef:
                   name: influxdb
                   key: password
-            - name: FLUENTD_PATH
-              value: /var/log/containers/*{{.Values.functionNamespace}}*.log
+            - name: LOG_PATH
+              value: /var/log/fission/*.log
           volumeMounts:
             - name: container-log
               mountPath: /var/log/
@@ -56,11 +82,8 @@ spec:
             - name: docker-log
               mountPath: /var/lib/docker/containers
               readOnly: true
-            - name: fission-log
-              mountPath: /var/log/fission
-              readOnly: false
-            - name: fluentd-config
-              mountPath: /etc/td-agent/
+            - name: fluentbit-config
+              mountPath: /fluent-bit/etc/
               readOnly: true
       serviceAccount: fission-svc
       volumes:
@@ -70,12 +93,9 @@ spec:
         - name: docker-log
           hostPath:
             path: /var/lib/docker/containers
-        - name: fission-log
-          hostPath:
-            path: /var/log/fission
-        # Fluentd config location: /etc/td-agent/td-agent.conf
-        - name: fluentd-config
+        # Fluentbit config location: /fluent-bit/etc/*.conf
+        - name: fluentbit-config
           configMap:
-            name: {{ .Release.Name }}-fission-fluentd
+            name: {{ .Release.Name }}-fission-fluentbit
   updateStrategy:
     type: RollingUpdate