Aster

Aster is a light, fast and powerful cache proxy written by rust.

It supports memcache/redis singleton/redis cluster protocol all in one. Aster can proxy with two models means:

1. proxy mode: the same as twemproxy.
2. cluster mode: proxy for redis cluster. You can use non-cluster redis client access the redis cluster.(Inspired with Corvus)

Usage

bash cargo build --release && RUST_LOG=libaster=info RUST_BACKTRACE=1 ./target/release/aster default.toml

Configuration

``` [[clusters]]

name of the cluster. Each cluster means one front-end port.

name="test-redis-cluster"

listen_addr means the cluster font end serve address.

listen_addr="0.0.0.0:9001"

cachetype only support memcache|redis|rediscluster

cachetype="rediscluster"

servers means cache backend. support two format:

for cache_type is memcache or redis, you can set it as:

#

servers = [

"127.0.0.1:7001:10 redis-1",

"127.0.0.1:7002:10 redis-2",

"127.0.0.1:7003:10 redis-3"]

#

as you can see, the format is consisted with:

#

"${addr}:hashweight ${nodealias}"

#

And, for redis_cluster you can set the item as:

#

servers = ["127.0.0.1:7000", "127.0.0.1:7001"]

#

which means the seed nodes to connect to redis cluster.

servers = ["127.0.0.1:7000", "127.0.0.1:7001"]

Work thread number, it's suggested as the number of your cpu(hyper-thread) number.

thread = 1

ReadTimeout is the socket read timeout which effects all in the socket in millisecond

read_timeout = 2000

WriteTimeout is the socket write timeout which effects all in the socket in millisecond

write_timeout = 2000

####################### Cluster Mode Special

fetch means fetch interval for backend cluster to keep cluster info become newer.

default 10 * 60 seconds

fetch = 600

readfromslave is the feature make slave balanced readed by client and ignore side effects.

readfromslave = true

####################### Proxy Mode Special

pingfaillimit means when ping fail reach the limit number, the node will be ejected from the cluster

until the ping is ok in future.

if pingfalilimit == 0, means that close the ping eject feature.

pingfaillimit=3

ping_interval means the interval of each ping was send into backend node in millisecond.

ping_interval=10000 ```