Add ethrex (lambdaclass) EL client to bal-devnet-2 infrastructure

Adds terraform node definitions and ansible configuration for ethrex,
a Rust-based execution layer client. All nodes start with count=0
(disabled) until the ethpandaops/ansible-collection-general ethrex
role is merged upstream.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: qu0b

ansible/inventories/devnet-2/group_vars/all/images.yaml

@@ -14,6 +14,7 @@ default_ethereum_client_images:
   nethermind: ethpandaops/nethermind:bal-devnet-2
   reth: ethpandaops/reth:bal-devnet-2
   nimbusel: ethpandaops/nimbus-eth1:bal-devnet-2
+  ethrex: ethpandaops/ethrex:bal-devnet-2
 
 default_tooling_images:
   mev_boost: ethpandaops/mev-boost:develop

ansible/inventories/devnet-2/group_vars/ethrex.yaml

@@ -0,0 +1,82 @@
+# role: ethpandaops.general.bootstrap
+bootstrap_default_user_authorized_keys_github_team_el:
+  - fmoletta
+  - JereSalo
+  - ilitteri
+
+# role: ethpandaops.general.ethereum_node
+ethereum_node_el: ethrex
+# role: ethpandaops.general.ethrex
+ethrex_container_name: execution
+ethrex_container_image: "{{ default_ethereum_client_images.ethrex }}"
+ethrex_container_env:
+  VIRTUAL_HOST: "{{ ethereum_node_rcp_hostname }}"
+  VIRTUAL_PORT: "{{ ethereum_node_el_ports_http_rpc | string }}"
+  LETSENCRYPT_HOST: "{{ ethereum_node_rcp_hostname }}"
+  RUST_LOG: "info"
+ethrex_container_volumes:
+  - "{{ ethrex_datadir }}:/data"
+  - "{{ ethrex_auth_jwt_path }}:/execution-auth.jwt:ro"
+  - "{{ eth_testnet_config_dir }}:/network-config:ro"
+ethrex_container_command_extra_args:
+  - --chain=/network-config/genesis.json
+  - --http.api=eth,net,web3,debug,admin,txpool
+  - --bootnodes={{ ethereum_el_bootnodes | join(',') }}
+  - --builder.gaslimit=80000000
+
+prometheus_config: |
+  global:
+    scrape_interval: 30s
+    evaluation_interval: 30s
+    scrape_timeout: 10s
+    external_labels:
+      instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"
+      ip_address: "{{ ansible_host }}"
+      network: "{{ ethereum_network_name }}"
+      testnet: "{{ ethereum_network_name }}"
+      execution_client: "{{ ethereum_node_el }}"
+      consensus_client: "{{ ethereum_node_cl }}"
+      supernode: "{{ ethereum_node_cl_supernode_enabled | bool | default(false) }}"
+  remote_write:
+    - queue_config:
+        batch_send_deadline: 5s
+        max_backoff: 500ms
+        max_samples_per_send: 500
+        min_backoff: 50ms
+        max_shards: 100
+      url: {{ prometheus_remote_push_url }}
+      remote_timeout: 10s
+      basic_auth:
+        username: {{ prometheus_remote_write_username }}
+        password: {{ prometheus_remote_write_password }}
+  scrape_configs:
+    - job_name: "prometheus"
+      metrics_path: "/metrics"
+      static_configs:
+        - targets: ["localhost:9090"]
+          labels:
+            instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"
+    - job_name: "node"
+      metrics_path: "/metrics"
+      static_configs:
+        - targets: ["172.17.0.1:9100"]
+          labels:
+            instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"
+    - job_name: "exporter"
+      metrics_path: "/metrics"
+      static_configs:
+        - targets: ["ethereum-metrics-exporter:9090"]
+          labels:
+            instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"
+    - job_name: "consensus_node"
+      metrics_path: "/metrics"
+      static_configs:
+        - targets: ["{{ vars[ethereum_node_cl + '_container_name'] }}:{{ ethereum_node_cl_ports_metrics }}"]
+          labels:
+            instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"
+    - job_name: "execution"
+      metrics_path: "/metrics"
+      static_configs:
+        - targets: ["execution:{{ ethereum_node_el_ports_metrics }}"]
+          labels:
+            instance: "{{ ethereum_network_name }}-{{ inventory_hostname }}"

terraform/devnet-2/ansible_inventory.tmpl

@@ -33,7 +33,7 @@ ${replace(gid, "-", "_")}
 
 # Execution client groups
 
-%{ for el in ["besu", "ethereumjs", "geth", "nethermind", "erigon", "reth", "nimbusel"] ~}
+%{ for el in ["besu", "ethereumjs", "geth", "nethermind", "erigon", "reth", "nimbusel", "ethrex"] ~}
 [${el}:children]
 %{ for gid, group in groups ~}
 %{ if split("-", gid)[0] != "bootnode" && split("-", gid)[0] != "mev" ~}

terraform/devnet-2/hetzner/main.tf

@@ -74,6 +74,7 @@ locals {
     var.lighthouse_besu_full,
     var.lighthouse_reth_full,
     var.lighthouse_nimbusel_full,
+    var.lighthouse_ethrex_full,
     var.prysm_geth_full,
     var.prysm_nethermind_full,
     var.prysm_erigon_full,
@@ -86,6 +87,7 @@ locals {
     var.lodestar_besu_full,
     var.lodestar_reth_full,
     var.lodestar_nimbusel_full,
+    var.lodestar_ethrex_full,
     var.nimbus_geth_full,
     var.nimbus_nethermind_full,
     var.nimbus_erigon_full,
@@ -111,6 +113,7 @@ locals {
     var.lighthouse_besu_super,
     var.lighthouse_reth_super,
     var.lighthouse_nimbusel_super,
+    var.lighthouse_ethrex_super,
     var.prysm_geth_super,
     var.prysm_nethermind_super,
     var.prysm_erigon_super,
@@ -123,6 +126,7 @@ locals {
     var.lodestar_besu_super,
     var.lodestar_reth_super,
     var.lodestar_nimbusel_super,
+    var.lodestar_ethrex_super,
     var.nimbus_geth_super,
     var.nimbus_nethermind_super,
     var.nimbus_erigon_super,

terraform/devnet-2/hetzner/nodes.tf

@@ -75,6 +75,15 @@ variable "lighthouse_nimbusel_super" {
   }
 }
 
+variable "lighthouse_ethrex_super" {
+  default = {
+    name            = "lighthouse-ethrex-super"
+    count           = 1
+    validator_start = 2000
+    validator_end   = 2200
+  }
+}
+
 # Prysm
 variable "prysm_geth_super" {
   default = {
@@ -185,6 +194,15 @@ variable "lodestar_nimbusel_super" {
   }
 }
 
+variable "lodestar_ethrex_super" {
+  default = {
+    name            = "lodestar-ethrex-super"
+    count           = 1
+    validator_start = 2200
+    validator_end   = 2400
+  }
+}
+
 # Nimbus
 variable "nimbus_geth_super" {
   default = {
@@ -407,6 +425,15 @@ variable "lighthouse_nimbusel_full" {
   }
 }
 
+variable "lighthouse_ethrex_full" {
+  default = {
+    name            = "lighthouse-ethrex-full"
+    count           = 0
+    validator_start = 0
+    validator_end   = 0
+  }
+}
+
 # Prysm
 variable "prysm_geth_full" {
   default = {
@@ -517,6 +544,15 @@ variable "lodestar_nimbusel_full" {
   }
 }
 
+variable "lodestar_ethrex_full" {
+  default = {
+    name            = "lodestar-ethrex-full"
+    count           = 0
+    validator_start = 0
+    validator_end   = 0
+  }
+}
+
 # Nimbus
 variable "nimbus_geth_full" {
   default = {