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author | Achilleas Pipinellis <axilleas@axilleas.me> | 2016-11-10 13:14:22 +0100 |
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committer | Achilleas Pipinellis <axilleas@axilleas.me> | 2016-11-10 13:14:22 +0100 |
commit | 646f81afac23b74b604c77af61254f90e205505f (patch) | |
tree | 468a3a94ffe5dc07b651c11b683f1c88df6d3082 /doc/administration | |
parent | 1e4f86744627fbf0d0190c7d76f30cd77480db37 (diff) | |
download | gitlab-ce-646f81afac23b74b604c77af61254f90e205505f.tar.gz |
Fix typos of Redis sentinel docs
Diffstat (limited to 'doc/administration')
-rw-r--r-- | doc/administration/high_availability/redis.md | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/doc/administration/high_availability/redis.md b/doc/administration/high_availability/redis.md index 6b16f9e791f..ca773ea20aa 100644 --- a/doc/administration/high_availability/redis.md +++ b/doc/administration/high_availability/redis.md @@ -5,7 +5,7 @@ topology with **Sentinel** service to watch and automatically start failover proceedings. You can choose to install and manage Redis and Sentinel yourself, use -a hosted, managed clouse solution or you can use or you can use the one +a hosted, managed cloud solution or you can use or you can use the one that comes bundled with Omnibus GitLab packages. > **Note:** Redis requires authentication for High Availability. See @@ -55,10 +55,10 @@ technology and provide a transparent proxy, which means that GitLab doesn't need any additional change, or will use Sentinel and manage it for you. If your provider, uses Sentinel method, see [GitLab Setup](#gitlab-setup) -to understant where you need to provide the list of servers and credentials. +to understand where you need to provide the list of servers and credentials. If you want to setup Redis by yourself, without using Omnibus, you can -read our documentation: [Configuring Redis for GitLab HA (Source Install)](redis_source.md) +read our documentation: [Configuring Redis for GitLab HA (source install)](redis_source.md). ## High Availability with Sentinel @@ -73,19 +73,19 @@ High Availability with Redis requires a few things: - Multiple Redis instances - Run Redis in a **Master** x **Slave** topology - Multiple Sentinel instances -- Application support and visiblity to all Sentinel and Redis instances +- Application support and visibility to all Sentinel and Redis instances Redis Sentinel can handle the most important tasks in a HA environment to help keep servers online with minimal to no downtime: - Monitors **Master** and **Slaves** instances to see if they are available -- Promote a **Slave** to **Master** when the **Master** fails. +- Promote a **Slave** to **Master** when the **Master** fails - Demote a **Master** to **Slave** when failed **Master** comes back online (to prevent - data-partitioning). -- Can be queried by clients to always connect to the current **Master** server. + data-partitioning) +- Can be queried by clients to always connect to the current **Master** server -When a **Master** fails to respond, it's the client responsability to handle timeout -and reconnect (querying a **Sentinel** for a new **Master**). +When a **Master** fails to respond, it's the client's responsibility to handle +timeout and reconnect (querying a **Sentinel** for a new **Master**). To get a better understanding on how to correctly setup Sentinel, please read the [Redis Sentinel documentation](http://redis.io/topics/sentinel) first, as @@ -113,7 +113,7 @@ the shared environment can bring your entire setup down. You also need to take in consideration the underlying network topology, making sure you have redundant connectivity between Redis / Sentinel and -GitLab instances, otherwhise the networks will become a single point of +GitLab instances, otherwise the networks will become a single point of failure. Read carefully how to configure the components below. @@ -132,7 +132,7 @@ simultaneously down. Please note that there are different requirements for Sentinel nodes. If you host them in the same Redis machines, you may need to take -that restrictions into consideration when calculating the ammount of +that restrictions into consideration when calculating the amount of nodes to be provisioned. See [Sentinel setup](#sentinel-setup) documentation for more information. @@ -171,10 +171,10 @@ the same Sentinels. Sentinels watches both other sentinels and Redis nodes. Whenever a Sentinel detects that a Redis node is not responding, it will announce that to the -other sentinels. You have to reach the **quorum**, the minimum ammount of +other sentinels. You have to reach the **quorum**, the minimum amount of sentinels that agrees that a node is down, to be able to start a failover. -Whenver the **quorum** is met, you need the **majority** of all known +Whenever the **quorum** is met, you need the **majority** of all known Sentinel nodes to be available and reachable, to elect the Sentinel **leader** who will take all the decisions to restore the service availability by: @@ -238,7 +238,7 @@ independent machines, both with **Redis** and **Sentinel**: - Redis Slave + Sentinel Make sure you've read [Redis Setup](#redis-setup) and [Sentinel Setup](#sentinel-setup) -before, to understant how and why the ammount of nodes came from. +before, to understand how and why the amount of nodes came from. For a recommended setup, that can resist more failures, you will install the Omnibus GitLab package in `5` independent machines, both with @@ -259,11 +259,11 @@ This is a summary of what are we going to do: independent ones. - Don't install Redis and Sentinel in the same machines your GitLab instance is running on. - - All machines must be able to talk to each other and accept incomming + - All machines must be able to talk to each other and accept incoming connection over Redis (`6379`) and Sentinel (`26379`) ports. - GitLab machines must be able to access these machines and with the same permissions. - - Protected them from indiscriminated access from external networks (Internet), + - Protected them from indiscriminating access from external networks (Internet), to harden the security. 1. Download/install Omnibus GitLab using **steps 1 and 2** from @@ -288,7 +288,7 @@ inside it. Your single-machine install will be the initial **Master**, and the `3` others should be configured as **Slave** pointing to this machine. -After replication catchs-up, you will need to stop services in the +After replication catches up, you will need to stop services in the single-machine install, to rotate the **Master** to one of the new nodes. Make the required changes in configuration and restart the new nodes again. @@ -310,7 +310,7 @@ You will need to configure the following in `/etc/gitlab/gitlab.rb`: 1. Define a `redis['bind']` address pointing to a local IP that your other machines can reach you. - - If you really need to bind to an external acessible IP, make + - If you really need to bind to an external accessible IP, make sure you add extra firewall rules to prevent unauthorized access. - You can also set bind to `0.0.0.0` which listen in all interfaces. @@ -332,7 +332,7 @@ You will need to configure the following in `/etc/gitlab/gitlab.rb`: 1. Define a `redis['bind']` address pointing to a local IP that your other machines can reach you. - - If you really need to bind to an external acessible IP, make + - If you really need to bind to an external accessible IP, make sure you add extra firewall rules to prevent unauthorized access. - You can also set bind to `0.0.0.0` which listen in all interfaces. @@ -384,7 +384,7 @@ installations. From the GitLab application perspective, all it requires is the correct credentials for the Sentinel nodes. While it doesn't require a list of all Sentinel nodes, in case of a failure, -it needs to access at least one of listeds. +it needs to access at least one of the listed. >**Note:** The following steps should be performed in the [GitLab application server](gitlab.md) @@ -425,7 +425,7 @@ by the Sentinel nodes, the Redis nodes will be reconfigured and the **Master** will change permanently (including in `redis.conf`) from one node to the other, until a new failover is initiated again. -The same thing will happen with `sentinel.conf` that will be overriten after the +The same thing will happen with `sentinel.conf` that will be overridden after the initial execution, after any new sentinel node starts watching the **Master**, or a failover promotes a different **Master** node. @@ -653,7 +653,7 @@ sentinel['quorum'] = 2 ### Control running services In the example above we've used `redis_sentinel_role` and `redis_master_role` -which simplify the ammount of configuration changes. +which simplify the amount of configuration changes. If you want more control, here is what each one sets for you automatically when enabled: |