mirror of
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added gateways, leafnodes, nats-account-server, fixed typos etc.
This commit is contained in:
Alberto Ricart
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gateways/README.md
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## Gateways
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Gateways enable connecting one or more clusters together; they allow the formation of super clusters from smaller clusters. Cluster and Gateway protocols listen in different ports. Clustering is used for adjacent servers; gateways are for joining clusters together. Typically all cluster nodes will also be gateway nodes, but this is not a requirement.
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Gateway configuration is similar to clustering:
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- gateways have a dedicated port where they listen for gateway requests
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- gateways gossip gateway members and remote discovered gateways
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Unlike clusters, gateways:
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- don't form a full mesh
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- are bound by uni-directional connections
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Gateways exist to:
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- reduce the number of connections required between servers
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- optimize the interest graph propagation
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## Gateway Connections
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A nats-server in a gateway role will specify a port where it will accept gateways connections. If the configuration specifies other _external_ `gateways`, the gateway will create one outbound gateway connection for each gateway in its configuration. It will also gossip other gateways it knows or discovered.
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If the local cluster has three gateway nodes, this means there will be three outbound connections to each external gateway.
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> In the example above cluster _A_ has configured gateway connections for _B_ (solid lines). B has discovered gateway connections to _A_ (dotted lines). Note that the number of outgoing connections always matches the number of gateways with the same name.
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> In this second example, again configured connections are shown with solid lines and discovered gateway connections are shown using dotted lines. Gateways _A_ and _C_ were both discovered via gossiping; _B_ discovered _A_ and _A_ discovered _C_.
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A key point in the description above is that each node in the cluster will make a connection to a single node in the remote cluster — a difference from the clustering protocol, where every node is directly connected to all other nodes.
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For those mathematically inclined, cluster connections are `N(N-1)/2` where _N_ is the number of nodes in the cluster. On gateway configurations, outbound connections are the summation of `Ni(M-1)` where Ni is the number of nodes in a gateway _i_, and _M_ is the total number of gateways. Inbound connections are the summation of `U-Ni` where U is the sum of all gateway nodes in all gateways, and N is the number of nodes in a gateway _i_. It works out that both inbound and outbound connection counts are the same.
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The number of connections required to join clusters using clustering vs. gateways is apparent very quickly. For 3 clusters, with N nodes:
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| Nodes per Cluster | Full Mesh Conns | Gateway Conns |
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| ---: | ----: | ----: |
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| 1 | 3 | 6|
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| 2 | 15 | 12 |
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| 3 | 36 | 18 |
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| 4 | 66 | 24 |
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| 5 | 105 | 30 |
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| 30 | 4005 | 180 |
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## Interest Propagation
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Gateways propagate interest using three different mechanisms:
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- Optimistic Mode
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- Interest-only Mode
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- Queue Subscriptions
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### Optimistic Mode
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When a publisher in _A_ publishes "foo", the _A_ gateway will check if cluster _B_ has registered _no_ interest in "foo". If not, it forwards "foo" to _B_. If upon receiving "foo", _B_ has no subscribers on "foo", _B_ will send a gateway protocol message to _A_ expressing that it has no interest on "foo", preventing future messages on "foo" from being forwarded.
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Should a subscriber on _B_ create a subscription to "foo", _B_ knowing that it had previously rejected interest on _foo_, will send a gateway protocol message to cancel its previous _no interest_ on "foo" in _A_.
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### Interest-only Mode
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When a gateway on _A_ sends many messages on various subjects for which _B_ has no interest. _B_ sends a gateway protocol message for _A_ to stop sending optimistically, and instead send if there's known interest in the subject. As subscriptions come and go on _B_, _B_ will update its subject interest with _A_.
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### Queue Subscriptions
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When a queue subscriber creates a new subscription, the gateway propagates the subscription interest to other gateways. The subscription interest is only propagated _once_ per _Account_ and subject. When the last queue subscriber is gone, the cluster interest is removed.
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Queue subscriptions work on _Interest-only Mode_ to honor NATS' queue semantics across the _Super Cluster_. For each queue group, a message is only delivered to a single queue subscriber. Only when a local queue group member is not found, is a message forwarded to a different interested cluster; gateways will always try to serve local queue subscribers first and only failover when a local queue subscriber is not found.
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### Gateway Configuration
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The [Gateway Configuration](gateway.md) document describes all the options available to gateways.
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100
gateways/gateway.md
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## Gateway Configuration
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The `gateway` configuration block is similar to a `cluster` block:
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```yaml
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gateway {
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name: "A"
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listen: "localhost:7222"
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authorization {
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user: gwu
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password: gwp
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}
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gateways: [
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{name: "A", url: "nats-gateway://gwu:gwp@localhost:7222"},
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{name: "B", url: "nats-gateway://gwu:gwp@localhost:7333"},
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{name: "C", url: "nats-gateway://gwu:gwp@localhost:7444"},
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]
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}
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```
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One difference is that instead of `routes` you specify `gateways`. As expected _self-gateway_ connections are ignored, so you can share gateway configurations with minimal fuzz.
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Starting a server:
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```text
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> nats-server -c A.conf
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[85803] 2019/05/07 10:50:55.902474 [INF] Starting nats-server version 2.0.0-RC11
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[85803] 2019/05/07 10:50:55.902547 [INF] Git commit [not set]
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[85803] 2019/05/07 10:50:55.903669 [INF] Gateway name is A
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[85803] 2019/05/07 10:50:55.903684 [INF] Listening for gateways connections on localhost:7222
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[85803] 2019/05/07 10:50:55.903696 [INF] Address for gateway "A" is localhost:7222
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[85803] 2019/05/07 10:50:55.903909 [INF] Listening for client connections on 0.0.0.0:4222
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[85803] 2019/05/07 10:50:55.903914 [INF] Server id is NBHUDBF3TVJSWCDPG2HSKI4I2SBSPDTNYEXEMOFAZUZYXVA2IYRUGPZU
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[85803] 2019/05/07 10:50:55.903917 [INF] Server is ready
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[85803] 2019/05/07 10:50:56.830669 [INF] 127.0.0.1:50892 - gid:2 - Processing inbound gateway connection
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[85803] 2019/05/07 10:50:56.830673 [INF] 127.0.0.1:50891 - gid:1 - Processing inbound gateway connection
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[85803] 2019/05/07 10:50:56.831079 [INF] 127.0.0.1:50892 - gid:2 - Inbound gateway connection from "C" (NBHWDFO3KHANNI6UCEUL27VNWL7NWD2MC4BI4L2C7VVLFBSMZ3CRD7HE) registered
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[85803] 2019/05/07 10:50:56.831211 [INF] 127.0.0.1:50891 - gid:1 - Inbound gateway connection from "B" (ND2UJB3GFUHXOQ2UUMZQGOCL4QVR2LRJODPZH7MIPGLWCQRARJBU27C3) registered
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[85803] 2019/05/07 10:50:56.906103 [INF] Connecting to explicit gateway "B" (localhost:7333) at 127.0.0.1:7333
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[85803] 2019/05/07 10:50:56.906104 [INF] Connecting to explicit gateway "C" (localhost:7444) at 127.0.0.1:7444
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[85803] 2019/05/07 10:50:56.906404 [INF] 127.0.0.1:7333 - gid:3 - Creating outbound gateway connection to "B"
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[85803] 2019/05/07 10:50:56.906444 [INF] 127.0.0.1:7444 - gid:4 - Creating outbound gateway connection to "C"
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[85803] 2019/05/07 10:50:56.906647 [INF] 127.0.0.1:7444 - gid:4 - Outbound gateway connection to "C" (NBHWDFO3KHANNI6UCEUL27VNWL7NWD2MC4BI4L2C7VVLFBSMZ3CRD7HE) registered
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[85803] 2019/05/07 10:50:56.906772 [INF] 127.0.0.1:7333 - gid:3 - Outbound gateway connection to "B" (ND2UJB3GFUHXOQ2UUMZQGOCL4QVR2LRJODPZH7MIPGLWCQRARJBU27C3) registered
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```
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Once all the gateways are up, these clusters of one will forward messages as expected:
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```text
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> nats-pub -s localhost:4444 foo bar
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Published [foo] : 'bar'
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# On a different session...
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> nats-sub -s localhost:4333 ">"
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Listening on [>]
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[#1] Received on [foo]: 'bar'
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```
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### `Gateway` Configuration Block
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| Property | Description |
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| :------ | :---- |
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| `advertise` | Hostport `<host>:<port>` to advertise to other gateways. |
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| `authorization` | Authorization block (same as other nats-server `authorization` configuration). |
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| `connect_retries` | Number of times the server will try to connect to a discovered gateway. |
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| `gateways` | List of Gateway entries - see below. |
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| `host` | Interface where the gateway will listen for incomming gateway connections. |
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| `listen` | Combines `host` and `port` as `<host>:<port>` |
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| `name` | Name for this cluster, all gateways belonging to the same cluster, should specify the same name. |
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| `port` | Port where the gateway will listen for incomming gateway connections. |
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| `reject_unknown` | If `true`, gateway will reject connections from gateways that are not configured in `gateways`. |
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| `tls` | TLS configuration block (same as other nats-server `tls` configuration). |
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#### `Gateway` Entry
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The `gateways` configuration block is a list of gateway entries with the following properties:
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| Property | Description |
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| :------ | :---- |
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| `name` | Gateway name. |
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| `url` | Hostport `<host>:<port>` describing where the remote gateway can be reached. If multiple IPs are returned, one is randomly selected. |
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| `urls` | A list of `url` |
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### `TLS` Configuration Block
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| Property | Description |
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| :------ | :---- |
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| `ca_file` | TLS certificate authority file. |
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| `cert_file` | TLS certificate file. |
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| `cipher_suites` | When set, only the specified TLS cipher suites will be allowed. Values must match golang version used to build the server. |
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| `curve_preferences` | List of TLS cypher curves to use in order. |
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| `insecure` | Skip certificate verfication. |
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| `key_file` | TLS certificate key file. |
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| `timeout` | TLS handshake timeout in fractional seconds. |
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| `verify_and_map` | If `true`, require and verify client certificates and use values map certificate values for authentication purposes. |
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| `verify` | If `true`, require and verify client certificates. |
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gateways/simple.svg
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After Width: | Height: | Size: 7.6 KiB |
Reference in New Issue
Block a user