今まで、Difyの helm に内用されているRedisを使用していましたが、best to use external redis とのことですので、別途インストールして使っていきます。
参考情報
redis:
# using embedded redis
# connection info would be set automatically
# best to use external redis if you have one
embedded: true
と書かれています。
ネームスペースを作る
# kubectl create namespace redis
helm でさくっとインストール
my-release の部分は、好きな名前に変えてください。
my-release-redis-node-0 のような Pod や Service が起動します。
# helm install my-release oci://registry-1.docker.io/bitnamicharts/redis \
--set replica.replicaCount=2 \
--set master.persistence.enabled=true \
--set master.persistence.size=5Gi \
--set sentinel.enabled=true \
--namespace redis
Pulled: registry-1.docker.io/bitnamicharts/redis:19.6.2
Digest: sha256:1f996c79bf42e3dd69abdac6dccbf6d2a6a96aeef89e0e17ee6b28aa20922b6d
NAME: my-release
NAMESPACE: redis
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
CHART NAME: redis
CHART VERSION: 19.6.2
APP VERSION: 7.2.5
** Please be patient while the chart is being deployed **
Redis® can be accessed via port 6379 on the following DNS name from within your cluster:
my-release-redis.redis.svc.cluster.local for read only operations
For read/write operations, first access the Redis® Sentinel cluster, which is available in port 26379 using the same domain name above.
To get your password run:
export REDIS_PASSWORD=$(kubectl get secret --namespace redis my-release-redis -o jsonpath="{.data.redis-password}" | base64 -d)
To connect to your Redis® server:
1. Run a Redis® pod that you can use as a client:
kubectl run --namespace redis redis-client --restart='Never' --env REDIS_PASSWORD=$REDIS_PASSWORD --image docker.io/bitnami/redis:7.2.5-debian-12-r2 --command -- sleep infinity
Use the following command to attach to the pod:
kubectl exec --tty -i redis-client \
--namespace redis -- bash
2. Connect using the Redis® CLI:
REDISCLI_AUTH="$REDIS_PASSWORD" redis-cli -h my-release-redis -p 6379 # Read only operations
REDISCLI_AUTH="$REDIS_PASSWORD" redis-cli -h my-release-redis -p 26379 # Sentinel access
To connect to your database from outside the cluster execute the following commands:
kubectl port-forward --namespace redis svc/my-release-redis 6379:6379 &
REDISCLI_AUTH="$REDIS_PASSWORD" redis-cli -h 127.0.0.1 -p 6379
WARNING: There are "resources" sections in the chart not set. Using "resourcesPreset" is not recommended for production. For production installations, please set the following values according to your workload needs:
- replica.resources
- sentinel.resources
+info https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/
起動確認
# kubectl get pod,svc -n redis
NAME READY STATUS RESTARTS AGE
pod/my-release-redis-node-0 2/2 Running 0 14m
pod/my-release-redis-node-1 2/2 Running 0 13m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/my-release-redis ClusterIP 10.103.121.24 <none> 6379/TCP,26379/TCP 14m
service/my-release-redis-headless ClusterIP None <none> 6379/TCP,26379/TCP 14m
パスワードの取得
# export REDIS_PASSWORD=$(kubectl get secret --namespace redis my-release-redis -o jsonpath="{.data.redis-password}" | base64 -d)
# echo $REDIS_PASSWORD
6NRNDTAngB
マスターの判別
# kubectl exec -it my-release-redis-node-0 -n redis -- redis-cli -a 6NRNDTAngB -p 26379 sentinel masters
Defaulted container "redis" out of: redis, sentinel
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
1) 1) "name"
2) "mymaster"
3) "ip"
4) "my-release-redis-node-0.my-release-redis-headless.redis.svc.cluster.local"
5) "port"
6) "6379"
7) "runid"
8) "0fe46dfa6a07eeba4d2fa571bb3499fabd745129"
9) "flags"
10) "master"
11) "link-pending-commands"
12) "0"
13) "link-refcount"
14) "1"
15) "last-ping-sent"
16) "0"
17) "last-ok-ping-reply"
18) "855"
19) "last-ping-reply"
20) "855"
21) "down-after-milliseconds"
22) "60000"
23) "info-refresh"
24) "8519"
25) "role-reported"
26) "master"
27) "role-reported-time"
28) "419865"
29) "config-epoch"
30) "0"
31) "num-slaves"
32) "1"
33) "num-other-sentinels"
34) "1"
35) "quorum"
36) "2"
37) "failover-timeout"
38) "180000"
39) "parallel-syncs"
40) "1"
レプリカの判別
# kubectl exec -it my-release-redis-node-0 -n redis -- redis-cli -a 6NRNDTAngB -p 26379 sentinel slaves mymaster
Defaulted container "redis" out of: redis, sentinel
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
1) 1) "name"
2) "my-release-redis-node-1.my-release-redis-headless.redis.svc.cluster.local:6379"
3) "ip"
4) "my-release-redis-node-1.my-release-redis-headless.redis.svc.cluster.local"
5) "port"
6) "6379"
7) "runid"
8) "867ee7037736bd499b4549f30b5c8b796b3d9fa1"
9) "flags"
10) "slave"
11) "link-pending-commands"
12) "0"
13) "link-refcount"
14) "1"
15) "last-ping-sent"
16) "0"
17) "last-ok-ping-reply"
18) "196"
19) "last-ping-reply"
20) "196"
21) "down-after-milliseconds"
22) "60000"
23) "info-refresh"
24) "9384"
25) "role-reported"
26) "slave"
27) "role-reported-time"
28) "452690"
29) "master-link-down-time"
30) "0"
31) "master-link-status"
32) "ok"
33) "master-host"
34) "my-release-redis-node-0.my-release-redis-headless.redis.svc.cluster.local"
35) "master-port"
36) "6379"
37) "slave-priority"
38) "100"
39) "slave-repl-offset"
40) "114908"
41) "replica-announced"
42) "1"
テスト
コンテナ起動して、クラスター内から接続テストを行います
# kubectl run temporary-pod --image=ubuntu --rm -it --restart=Never -- /bin/bash
# apt update
# apt install -y python3 python3-pip python3-venv
# python3 -m venv myenv
# source myenv/bin/activate
# pip3 install redis
# echo "
import redis
r = redis.StrictRedis(
host='my-release-redis-headless.redis.svc.cluster.local',
port=6379,
password='6NRNDTAngB',
decode_responses=True
)
r.set('mykey', 'Hello, Redis!')
value = r.get('mykey')
print(f'The value of \'mykey\' is: {value}')
" > redis_test.py
# python3 redis_test.py
The value of 'mykey' is: Hello, Redis!
正しく動いてくれました🍻
これで、Dify が使用する
が出揃いましたので、次は、これら外部のサービスを使用した Dify のインストールにチャレンジしてみたいと思います。