A new option instructs the server to perform the TLS handshake first,
that is prior to sending the INFO protocol to the client.
Only clients that implement equivalent option would be able to
connect if the server runs with this option enabled.
The configuration would look something like this:
```
...
tls {
cert_file: ...
key_file: ...
handshake_first: true
}
```
The same option can be set to "auto" or a Go time duration to fallback
to the old behavior. This is intended for deployments where it is known
that not all clients have been upgraded to a client library providing
the TLS handshake first option.
After the delay has elapsed without receiving the TLS handshake from
the client, the server reverts to sending the INFO protocol so that
older clients can connect. Clients that do connect with the "TLS first"
option will be marked as such in the monitoring's Connz page/result.
It will allow the administrator to keep track of applications still
needing to upgrade.
The configuration would be similar to:
```
...
tls {
cert_file: ...
key_file: ...
handshake_first: auto
}
```
With the above value, the fallback delay used by the server is 50ms.
The duration can be explcitly set, say 300 milliseconds:
```
...
tls {
cert_file: ...
key_file: ...
handshake_first: "300ms"
}
```
It is understood that any configuration other that "true" will result
in the server sending the INFO protocol after the elapsed amount of
time without the client initiating the TLS handshake. Therefore, for
administrators that do not want any data transmitted in plain text,
the value must be set to "true" only. It will require applications
to be updated to a library that provides the option, which may or
may not be readily available.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
Several strategies which are listed below.
1. Checking a RaftNode to see if it is the leader now uses atomics.
2. Checking if we are the JetStream meta leader from the server now uses an atomic.
3. Accessing the JetStream context no longer requires a server lock, uses atomic.Pointer.
4. Filestore syncBlocks would hold msgBlock locks during sync, now does not.
Signed-off-by: Derek Collison <derek@nats.io>
- Added a new internal function `handleResponse` that accepts the HTTP
status code and sets it after setting the headers
- Added tests for the `/healthz` endpoint for the `ok`, `error` and `unavailable` statuses
- Changed the IETF API health check URL to
https://datatracker.ietf.org/doc/html/draft-inadarei-api-health-checkResolves#4436
Resolves problems of [issue
#3773](https://github.com/nats-io/nats-server/issues/3773).
With this fix, NATS Server will locally determine it's own certificate's
issuer from either the configured server certificate (bundle of leaf
cert plus optional intermediate CA certs) or from the configured server
CA trust store, as follows:
1. The operator may provide the server's certificate issuer in the
second position of the server's certificate configuration (typically
`cert_file` but may be `cert_store` on the Windows platform). If a
candidate issuer is found here it is PKI validated as the actual issuer
of the server's cert else a hard error.
2. If not found in [1], NATS Server will seek to create at least one
verified chain with its configured trust store (typically `ca_file` but
could by the system trust store if not configured). It will derive the
issuer from the first verified chain. If no verified chain can be formed
it is a hard error.
This is similar to PR #4115 but for LeafNodes.
Compression mode can be set on both side (the accept and in remotes).
```
leafnodes {
port: 7422
compression: s2_best
remotes [
{
url: "nats://host2:74222"
compression: s2_better
}
]
}
```
Possible modes are similar than for routes (described in PR #4115),
except that when not defined we default to `s2_auto`.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
This is similar to PR #4115 but for LeafNodes.
Compression mode can be set on both side (the accept and in remotes).
```
leafnodes {
port: 7422
compression: s2_best
remotes [
{
url: "nats://host2:74222"
compression: s2_better
}
]
}
```
Possible modes are similar than for routes (described in PR #4115),
except that when not defined we default to `s2_auto`.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
The new field `compression` in the `cluster{}` block allows to
specify which compression mode to use between servers.
It can be simply specified as a boolean or a string for the
simple modes, or as an object for the "s2_auto" mode where
a list of RTT thresholds can be specified.
By default, if no compression field is specified, the server
will use the s2_auto mode with default RTT thresholds of
10ms, 50ms and 100ms for the "uncompressed", "fast", "better"
and "best" modes.
```
cluster {
..
# Possible values are "disabled", "off", "enabled", "on",
# "accept", "s2_fast", "s2_better", "s2_best" or "s2_auto"
compression: s2_fast
}
```
To specify a different list of thresholds for the s2_auto,
here is how it would look like:
```
cluster {
..
compression: {
mode: s2_auto
# This means that for RTT up to 5ms (included), then
# the compression level will be "uncompressed", then
# from 5ms+ to 15ms, the mode will switch to "s2_fast",
# then from 15ms+ to 50ms, the level will switch to
# "s2_better", and anything above 50ms will result
# in the "s2_best" compression mode.
rtt_thresholds: [5ms, 15ms, 50ms]
}
}
```
Note that the "accept" mode means that a server will accept
compression from a remote and switch to that same compression
mode, but will otherwise not initiate compression. That is,
if 2 servers are configured with "accept", then compression
will actually be "off". If one of the server had say s2_fast
then they would both use this mode.
If a server has compression mode set (other than "off") but
connects to an older server, there will be no compression between
those 2 routes.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
New configuration fields:
```
cluster {
...
pool_size: 5
accounts: ["A", "B"]
}
```
The configuration `pool_size` in the example above means that this
server will create 5 routes to a remote server, assuming that that
server has the same `pool_size` setting.
Accounts (which are not part of the `accounts[]` configuration)
are assigned a specific route in this pool, and this will be the
same route on all servers in the cluster.
Accounts that are defined in the `accounts` field will each have
a dedicated route connection. This will allow suppression of the
account name in some of the route protocols, reducing bytes transmitted
which may increase performance.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
New configuration fields:
```
cluster {
...
pool_size: 5
accounts: ["A", "B"]
}
```
The configuration `pool_size` in the example above means that this
server will create 5 routes to a remote server, assuming that that
server has the same `pool_size` setting.
Accounts (which are not part of the `accounts[]` configuration)
are assigned a specific route in this pool, and this will be the
same route on all servers in the cluster.
Accounts that are defined in the `accounts` field will each have
a dedicated route connection. This will allow suppression of the
account name in some of the route protocols, reducing bytes transmitted
which may increase performance.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
