Release 7.10.0 - See CHANGELOG.md

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 7.10.0 2024-07-05 <dave at tiredofit dot ca>
+
+   ### Added
+      - Add host_override function
+
+
 ## 7.9.1 2024-06-26 <dave at tiredofit dot ca>
 
    ### Changed

README.md

@@ -52,6 +52,7 @@ Dockerfile to build an [alpine](https://www.alpinelinux.org/) linux container im
       - [Log Shipping Parsing](#log-shipping-parsing)
       - [Fluent-Bit Options](#fluent-bit-options)
     - [Firewall Options|](#firewall-options)
+      - [Host Override Options](#host-override-options)
       - [IPTables Options](#iptables-options)
       - [Fail2Ban Options](#fail2ban-options)
     - [Permissions](#permissions)
@@ -372,6 +373,19 @@ FIREWALL_RULE_00=-I INPUT -p tcp -m tcp -s 101.69.69.101 --dport 389 -j ACCEPT
 FIREWALL_RULE_01=-I INPUT -p tcp -m tcp -s 0.0.0.0/0 --dport 389 -j DROP
 ````
 
+##### Host Override Options
+
+Sometimes you may need to do some host file trickery. This will add an entry to the contains hosts file.
+
+Instead of relying on environment variables one can put a `iptables-restore` compatible ruleset below and it will be imported on container start.
+
+| Parameter                    | Description               | Default |
+| ---------------------------- | ------------------------- | ------- |
+| `CONTAINER_HOST_OVERRIDE_01` | Create manual hosts entry |         |
+
+Make the value `<destination> override1 override2` eg `1.2.3.4 example.org example.com`. If you omit an IP Address and instead use a domain name it will attempt to look it up to an IP eg `proxy example.com example.org`
+
+
 ##### IPTables Options
 
 Instead of relying on environment variables one can put a `iptables-restore` compatible ruleset below and it will be imported on container start.

install/assets/functions/00-container

@@ -681,6 +681,25 @@ grant_sudo() {
     output_on
 }
 
+host_override() {
+    ## Adds entry to /etc/hosts file
+    ## Usage CONTAINER_HOST_OVERRIDE01=destination_ip domain1 domain2 domain3
+    ## If you use a host name instead of destination_ip it will attempt to resolve it
+    _hostnum=$(printenv | sort | grep -cE '^CONTAINER_HOST_OVERRIDE_([0-9].)')
+    for (( _host = 01; _host <= _hostnum; _host++ )) ; do
+        _host=$(printf "%02d" $_host)
+        host_line=CONTAINER_HOST_OVERRIDE_${_host}
+        host_ip=$(echo ${!host_line} | awk '{print $1}')
+
+        if [[ ! "${host_ip}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            host_ip="$(getent ahostsv4 "${host_ip}" | grep -m 1 STREAM  | awk '{print $1}')"
+        fi
+
+        echo "# Added automatically by CONTAINER_HOST_OVERRIDE_${_host}" >> /etc/hosts
+        echo "${host_ip} $(echo ${!host_line} | cut -d' ' -f2-)" >> /etc/hosts
+    done
+}
+
 install_template() {
     ## Copies configuration template to the destination as the specified USER
     ## Usage install_template <copy-as-user> <source_file> <desintation_location+file> <optional chmod mode>

install/etc/cont-init.d/00-startup

@@ -160,5 +160,6 @@ zcat () {
 }
 EOF
 
+host_override
 liftoff
 output_on