mirror of
https://github.com/status-im/consul.git
synced 2025-01-10 05:45:46 +00:00
c310451b2b
Play a trick with CLOEXEC to pass the envoy bootstrap configuration as an open file descriptor to the exec'd envoy process. The file only briefly touches disk before being unlinked. We convince envoy to read from this open file descriptor by using the /dev/fd/$FDNUMBER mechanism to read the open file descriptor as a file. Because the filename no longer has an extension envoy's sniffing logic falls back on JSON instead of YAML, so the bootstrap configuration must be generated as JSON instead.
Consul API client
This package provides the api package which attempts to
provide programmatic access to the full Consul API.
Currently, all of the Consul APIs included in version 0.6.0 are supported.
Documentation
The full documentation is available on Godoc
Usage
Below is an example of using the Consul client:
package main
import "github.com/hashicorp/consul/api"
import "fmt"
func main() {
// Get a new client
client, err := api.NewClient(api.DefaultConfig())
if err != nil {
panic(err)
}
// Get a handle to the KV API
kv := client.KV()
// PUT a new KV pair
p := &api.KVPair{Key: "REDIS_MAXCLIENTS", Value: []byte("1000")}
_, err = kv.Put(p, nil)
if err != nil {
panic(err)
}
// Lookup the pair
pair, _, err := kv.Get("REDIS_MAXCLIENTS", nil)
if err != nil {
panic(err)
}
fmt.Printf("KV: %v %s\n", pair.Key, pair.Value)
}
To run this example, start a Consul server:
consul agent -dev
Copy the code above into a file such as main.go.
Install and run. You'll see a key (REDIS_MAXCLIENTS) and value (1000) printed.
$ go get
$ go run main.go
KV: REDIS_MAXCLIENTS 1000
After running the code, you can also view the values in the Consul UI on your local machine at http://localhost:8500/ui/dc1/kv