diff --git a/.env.sample b/.env.sample
index 1f461d1..32733b4 100644
--- a/.env.sample
+++ b/.env.sample
@@ -4,10 +4,11 @@ SECRET_OAUTH2_SECRET_VERSION=v1
 
 COMPOSE_FILE="compose.yml"
 
-MONGO_URL=mongodb://db:27017/wekan
+# Set this to run mongodb in replicaset mode (needs initialisation!)
+# COMPOSE_FILE="${COMPOSE_FILE}:compose.rs.yml"
 
-DOMAIN=board.example.com
-ROOT_URL=https://board.example.com
+DOMAIN=board.${DOMAIN}
+ROOT_URL=https://board.${DOMAIN}
 
 DEBUG=false
 
@@ -28,7 +29,7 @@ RICHER_CARD_COMMENT_EDITOR=false
 OAUTH2_ENABLED=false
 # OAUTH2_LOGIN_STYLE=redirect
 # OAUTH2_CLIENT_ID=wekan
-# OAUTH2_SERVER_URL=https://sso.example.com
+# OAUTH2_SERVER_URL=https://sso.${DOMAIN}
 # OAUTH2_AUTH_ENDPOINT=/application/o/authorize/
 # OAUTH2_USERINFO_ENDPOINT=/application/o/userinfo/
 # OAUTH2_TOKEN_ENDPOINT=/application/o/token/
diff --git a/README.md b/README.md
index 5478882..7f374e4 100644
--- a/README.md
+++ b/README.md
@@ -27,3 +27,15 @@ See original [docker-compose.yml](https://github.com/wekan/wekan/blob/master/doc
 
 
 For more, see [`docs.coopcloud.tech`](https://docs.coopcloud.tech).
+
+
+## use mongodb with replicaset 
+
+needed to enable oplog setting in wekan, which isneeded to run bigger instances?
+
+after mongo conaintainer came up the first time run:
+
+```
+abra app run wekan.example.org db mongo
+> rs.initiate() 
+```
\ No newline at end of file
diff --git a/compose.rs.yml b/compose.rs.yml
new file mode 100644
index 0000000..c9af041
--- /dev/null
+++ b/compose.rs.yml
@@ -0,0 +1,10 @@
+version: "3.8"
+
+services:
+  db:
+    command: mongod --oplogSize 128 --replSet rs0 
+
+  app:
+    environment:
+      - MONGO_URL=mongodb://db:27017/wekan?replicaSet=rs01
+      - MONGO_OPLOG_URL=mongodb://db:27017/local?replicaSet=rsWekan=value
diff --git a/compose.yml b/compose.yml
index 825fa80..ffa9cc3 100644
--- a/compose.yml
+++ b/compose.yml
@@ -2,7 +2,7 @@ version: '3.8'
 services:
   db:
     image: mongo:4.4
-    command: mongod --logpath /dev/null --oplogSize 128 --quiet
+    command: mongod --oplogSize 128 --replSet rs0 
     volumes:
       - wekan-db:/data/db
     networks:
@@ -24,6 +24,7 @@ services:
     image: quay.io/wekan/wekan:v6.28
     environment:
       - MONGO_URL
+      - MONGO_OPLOG_URL
       - DOMAIN
       - ROOT_URL
       - DEBUG