diff --git a/compose/docker-compose-fixturenet-eth.yml b/compose/docker-compose-fixturenet-eth.yml
index d1c957ea..94c573de 100644
--- a/compose/docker-compose-fixturenet-eth.yml
+++ b/compose/docker-compose-fixturenet-eth.yml
@@ -3,9 +3,10 @@ version: '3.7'
 services:
   fixturenet-eth-bootnode-geth:
     hostname: fixturenet-eth-bootnode-geth
+    env_file:
+      - ../config/fixturenet-eth/fixturenet-eth.env
     environment:
       RUN_BOOTNODE: "true"
-      NETWORK_ID: "1212"
     image: cerc/fixturenet-eth-geth:local
     networks:
       fixturenet-eth-net:
@@ -13,12 +14,8 @@ services:
 
   fixturenet-eth-geth-1:
     hostname: fixturenet-eth-geth-1
-    environment:
-      NETWORK_ID: "1212"
-      ACCOUNT_PASSWORD: "secret1212"
-      ETHERBASE: "0xe6CE22afe802CAf5fF7d3845cec8c736ecc8d61F"
-      ENODE: "enode://af22c29c316ad069cf48a09a4ad5cf04a251b411e45098888d114c6dd7f489a13786620d5953738762afa13711d4ffb3b19aa5de772d8af72f851f7e9c5b164a@fixturenet-eth-bootnode-geth:30303"
-      JWT: "0x6cdcac3501046a08e186730dd8bd136cfaf0fdc1fc955f6e15ad3068c0ff2af0"
+    env_file:
+      - ../config/fixturenet-eth/fixturenet-eth.env
     image: cerc/fixturenet-eth-geth:local
     depends_on:
       - fixturenet-eth-bootnode-geth
@@ -29,12 +26,8 @@ services:
 
   fixturenet-eth-geth-2:
     hostname: fixturenet-eth-geth-2
-    environment:
-      NETWORK_ID: "1212"
-      ACCOUNT_PASSWORD: "secret1212"
-      ETHERBASE: "0xe6CE22afe802CAf5fF7d3845cec8c736ecc8d61F"
-      ENODE: "enode://af22c29c316ad069cf48a09a4ad5cf04a251b411e45098888d114c6dd7f489a13786620d5953738762afa13711d4ffb3b19aa5de772d8af72f851f7e9c5b164a@fixturenet-eth-bootnode-geth:30303"
-      JWT: "0x6cdcac3501046a08e186730dd8bd136cfaf0fdc1fc955f6e15ad3068c0ff2af0"
+    env_file:
+      - ../config/fixturenet-eth/fixturenet-eth.env
     image: cerc/fixturenet-eth-geth:local
     depends_on:
       - fixturenet-eth-bootnode-geth
@@ -52,9 +45,10 @@ services:
 
   fixturenet-eth-lighthouse-1:
     hostname: fixturenet-eth-lighthouse-1
+    env_file:
+      - ../config/fixturenet-eth/fixturenet-eth.env
     environment:
       NODE_NUMBER: "1"
-      JWT: "0x6cdcac3501046a08e186730dd8bd136cfaf0fdc1fc955f6e15ad3068c0ff2af0"
       ETH1_ENDPOINT: "http://fixturenet-eth-geth-1:8545"
       EXECUTION_ENDPOINT: "http://fixturenet-eth-geth-1:8551"
     image: cerc/fixturenet-eth-lighthouse:local
@@ -68,9 +62,10 @@ services:
   
   fixturenet-eth-lighthouse-2:
     hostname: fixturenet-eth-lighthouse-2
+    env_file:
+      - ../config/fixturenet-eth/fixturenet-eth.env
     environment:
       NODE_NUMBER: "2"
-      JWT: "0x6cdcac3501046a08e186730dd8bd136cfaf0fdc1fc955f6e15ad3068c0ff2af0"
       ETH1_ENDPOINT: "http://fixturenet-eth-geth-2:8545"
       EXECUTION_ENDPOINT: "http://fixturenet-eth-geth-2:8551"
       LIGHTHOUSE_GENESIS_STATE_URL: "http://fixturenet-eth-lighthouse-1:8001/eth/v2/debug/beacon/states/0"
diff --git a/config/fixturenet-eth/fixturenet-eth.env b/config/fixturenet-eth/fixturenet-eth.env
new file mode 100644
index 00000000..c4088e69
--- /dev/null
+++ b/config/fixturenet-eth/fixturenet-eth.env
@@ -0,0 +1,11 @@
+# The password used to access test accounts (eg, via personal_unlockAccount).  The password is the same for all accounts.
+ACCOUNT_PASSWORD=secret1212
+
+# ENODE of the geth bootnode.
+ENODE="enode://af22c29c316ad069cf48a09a4ad5cf04a251b411e45098888d114c6dd7f489a13786620d5953738762afa13711d4ffb3b19aa5de772d8af72f851f7e9c5b164a@fixturenet-eth-bootnode-geth:30303"
+
+# JWT shared by geth and lighthouse for authentication.
+JWT="0x6cdcac3501046a08e186730dd8bd136cfaf0fdc1fc955f6e15ad3068c0ff2af0"
+
+# Should match the definition of fixturenet-eth-net.
+NETRESTRICT="172.16.254.0/28"
diff --git a/container-build/cerc-fixturenet-eth-geth/run-el.sh b/container-build/cerc-fixturenet-eth-geth/run-el.sh
index 857ca2e0..657dd719 100755
--- a/container-build/cerc-fixturenet-eth-geth/run-el.sh
+++ b/container-build/cerc-fixturenet-eth-geth/run-el.sh
@@ -1,12 +1,15 @@
 #!/bin/bash
 
+ETHERBASE=`cat /opt/testnet/accounts/accounts.csv | head -1 | cut -d',' -f2`
+NETWORK_ID=`cat /opt/testnet/el/el-config.yaml | grep 'chain_id' | awk '{ print $2 }'`
+
 if [ "true" == "$RUN_BOOTNODE" ]; then 
     geth \
       --nodekeyhex="b0ac22adcad37213c7c565810a50f1772291e7b0ce53fb73e7ec2a3c75bc13b5" \
       --nodiscover \
       --ipcdisable \
       --networkid=${NETWORK_ID} \
-      --netrestrict="172.16.254.0/28"  2>&1 | tee /var/log/geth_bootnode.log
+      --netrestrict="${NETRESTRICT}"  2>&1 | tee /var/log/geth_bootnode.log
 else
     cd /opt/testnet/accounts
     ./import_keys.sh
@@ -25,7 +28,7 @@ else
       --authrpc.vhosts="*" \
       --authrpc.jwtsecret="/opt/testnet/build/el/jwtsecret" \
       --networkid=${NETWORK_ID} \
-      --netrestrict="172.16.254.0/28" \
+      --netrestrict="${NETRESTRICT}" \
       --syncmode=full \
       --mine \
       --miner.threads=1 \