Document InfluxDB Enterprise startup process (#2069)

* document influxdb enterprise startup process, closes influxdata/DAR#114

* minor adjustments to influxdb enterprise startup doc

* minor typo fixes in influxdb enterprise startup doc

content/enterprise_influxdb/v1.8/about-the-project/_index.md

@@ -3,7 +3,7 @@ title: About the project
 description: >
   Release notes, licenses, and third-party software details for InfluxDB Enterprise.
 menu:
-  enterprise_influxdb_1_8:
+  enterprise_influxdb_1_8_ref:
     weight: 10
 ---
 

content/enterprise_influxdb/v1.8/about-the-project/release-notes-changelog.md

@@ -3,7 +3,7 @@ title: InfluxDB Enterprise 1.8 release notes
 description: >
   Important changes and and what's new in each version InfluxDB Enterprise.
 menu:
-  enterprise_influxdb_1_8:
+  enterprise_influxdb_1_8_ref:
     name: Release notes
     weight: 10
     parent: About the project

content/enterprise_influxdb/v1.8/administration/anti-entropy/_index.md

@@ -5,7 +5,7 @@ aliases:
   - /enterprise_influxdb/v1.8/guides/Anti-Entropy/
 menu:
   enterprise_influxdb_1_8:
-    name: Use Anti-Entropy service
+    name: Use Anti-entropy service
     weight: 60
     parent: Administration
 ---
@@ -92,7 +92,7 @@ A "flapping" dashboard means data visualizations change when data is refreshed
 and pulled from a node with entropy (inconsistent data).
 It is the visual manifestation of getting [different results from the same query](#different-results-for-the-same-query).
 
-<img src="/img/kapacitor/flapping-dashboard.gif" alt="Flapping dashboard" style="width:100%; max-width:800px">
+<img src="/img/enterprise/1-6-flapping-dashboard.gif" alt="Flapping dashboard" style="width:100%; max-width:800px">
 
 ## Technical details
 

content/enterprise_influxdb/v1.8/administration/anti-entropy/anti-entropy-api.md

@@ -4,9 +4,11 @@ description: >
   Monitor and repair shards on InfluxDB Enterprise data nodes the InfluxDB Anti-Entropy API.
 menu:
   enterprise_influxdb_1_8:
-    name: Anti-Entropy API
+    name: Anti-entropy API
     weight: 70
-    parent: Administration
+    parent: Use Anti-entropy service
+aliases:
+  - /enterprise_influxdb/v1.8/administration/anti-entropy-api/
 ---
 
 >**Note:** The Anti-Entropy API is available from the meta nodes and is only available when the Anti-Entropy service is enabled in the data node configuration settings. For information on the configuration settings, see

content/enterprise_influxdb/v1.8/concepts/_index.md

@@ -4,7 +4,7 @@ description: Clustering and other key concepts in InfluxDB Enterprise.
 aliases:
     - /enterprise/v1.8/concepts/
 menu:
-  enterprise_influxdb_1_8:
+  enterprise_influxdb_1_8_ref:
     name: Concepts
     weight: 50
 ---

content/enterprise_influxdb/v1.8/concepts/clustering.md

@@ -5,7 +5,7 @@ description: >
 aliases:
     - /enterprise/v1.8/concepts/clustering/
 menu:
-  enterprise_influxdb_1_8:
+  enterprise_influxdb_1_8_ref:
     name: Clustering
     weight: 10
     parent: Concepts

content/enterprise_influxdb/v1.8/concepts/glossary.md

@@ -4,7 +4,7 @@ description: Terms related to InfluxDB Enterprise.
 aliases:
     - /enterprise/v1.8/concepts/glossary/
 menu:
-  enterprise_influxdb_1_8:
+  enterprise_influxdb_1_8_ref:
     weight: 20
     parent: Concepts
 ---

content/enterprise_influxdb/v1.8/concepts/influxdb-enterprise-startup.md

@@ -0,0 +1,85 @@
+---
+title: InfluxDB Enterprise startup process
+description: >
+  On startup, InfluxDB Enterprise starts all subsystems and services in a deterministic order.
+menu:
+  enterprise_influxdb_1_8_ref:
+    weight: 10
+    name: Startup process
+    parent: Concepts
+---
+
+On startup, InfluxDB Enterprise starts all subsystems and services in the following order:
+
+1. [TSDBStore](#tsdbstore)
+2. [Monitor](#monitor)
+3. [Cluster](#cluster)
+4. [Precreator](#precreator)
+5. [Snapshotter](#snapshotter)
+6. [Continuous Query](#continuous-query)
+7. [Announcer](#announcer)
+8. [Retention](#retention)
+9. [Stats](#stats)
+10. [Anti-entropy](#anti-entropy)
+11. [HTTP API](#http-api)
+
+A **subsystem** is a collection of related services managed together as part of a greater whole.
+A **service** is a process that provides specific functionality.
+
+## Subsystems and services
+
+### TSDBStore
+The TSDBStore subsystem starts and manages the TSM storage engine.
+This includes services such as the points writer (write), reads (query),
+and [hinted handoff (HH)](/enterprise_influxdb/v1.8/concepts/clustering/#hinted-handoff).
+TSDBSTore first opens all the shards and loads write-ahead log (WAL) data into the in-memory write cache.
+If `influxd` was cleanly shutdown previously, there will not be any WAL data.
+It then loads a portion of each shard's index.
+
+{{% note %}}
+#### Index versions and startup times
+If using `inmem` indexing, InfluxDB loads all shard indexes into memory, which,
+depending on the number of series in the database, can take time.
+If using `tsi1` indexing, InfluxDB only loads hot shard indexes
+(the most recent shards or shards currently being written to) into memory and
+stores cold shard indexes on disk.
+Use `tsi1` indexing to see shorter startup times.
+{{% /note %}}
+
+### Monitor
+The Monitor service provides statistical and diagnostic information to InfluxDB about InfluxDB itself.
+This information helps with database troubleshooting and performance analysis.
+
+### Cluster
+The Cluster service provides implementations of InfluxDB OSS v1.8 interfaces
+that operate on an InfluxDB Enterprise v1.8 cluster.
+
+### Precreator
+The Precreator service creates shards before they are needed.
+This ensures necessary shards exist before new time series data arrives and that
+write-throughput is not affected the creation of a new shard.
+
+### Snapshotter
+The Snapshotter service routinely creates snapshots of InfluxDB Enterprise metadata.
+
+### Continuous Query
+The Continuous Query (CQ) subsystem manages all InfluxDB CQs.
+
+### Announcer
+The Announcer service announces a data node's status to meta nodes.
+
+### Retention
+The Retention service enforces [retention policies](/influxdb/v1.8/concepts/glossary/#retention-policy-rp)
+and drops data as it expires.
+
+### Stats
+The Stats service monitors cluster-level statistics.
+
+### Anti-entropy
+The Anti-entropy (AE) subsystem is responsible for reconciling differences between shards.
+For more information, see [Use anti-entropy](/enterprise_influxdb/v1.8/administration/anti-entropy/).
+
+### HTTP API
+The InfluxDB HTTP API service provides a public facing interface to interact with
+InfluxDB Enterprise and internal interfaces used within the InfluxDB Enterprise cluster.
+

content/enterprise_influxdb/v1.8/install-and-deploy/_index.md

@@ -6,7 +6,7 @@ aliases:
 menu:
   enterprise_influxdb_1_8:
     name: Install and deploy
-    weight: 70
+    weight: 30
 ---
 
 Install or deploy your InfluxDB Enterprise cluster in the environment of your choice:

content/enterprise_influxdb/v1.8/install-and-deploy/production_installation/_index.md

@@ -6,7 +6,7 @@ aliases:
 menu:
   enterprise_influxdb_1_8:
     name: Install in your environment
-    weight: 40
+    weight: 10
     parent: Install and deploy
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