[Fixtures] ./gradlew :test:fixtures:krb5kdc-fixture:composeBuild failure

[r1walz]

While running docker setup fixtures locally on Mac, krb5kdc-fixture fails with error

/bin/sh: 1: cannot create /etc/hosts: Read-only file system

Hot fix requires removing phrase && echo "127.0.0.1 kerberos.build.opensearch.org" >> /etc/hosts from the Dockerfile.

I have verified that kerberos.build.opensearch.org is already present in the /etc/hosts file created on the containers. We should remove this redundant statement from the Dockerfile.

Verification of presence:

$ ./gradlew :test:fixtures:krb5kdc-fixture:composeUp

> Configure project :
========================= WARNING =========================
         Backwards compatibility tests are disabled!
See https://github.com/opensearch-project/OpenSearch/issues/4173
===========================================================
=======================================
OpenSearch Build Hamster says Hello!
  Gradle Version        : 8.2.1
  OS Info               : Mac OS X 13.4 (x86_64)
  JDK Version           : 11 (Amazon Corretto JDK)
  JAVA_HOME             : /Users/rashiwal/.sdkman/candidates/java/11.0.19-amzn
  Random Testing Seed   : C4E9F61FE2F26BF1
  In FIPS 140 mode      : false
=======================================

> Task :test:fixtures:krb5kdc-fixture:composeUp
 Network 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__default  Creating
 Network 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__default  Created
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs_1  Creating
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa_1  Creating
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa_1  Created
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs_1  Created
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs_1  Starting
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa_1  Starting
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa_1  Started
 Container 7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs_1  Started
Will use localhost as host of hdfs
Will use localhost as host of peppa
Probing TCP socket on localhost:64965 of 'hdfs_1'
TCP socket on localhost:64965 of 'hdfs_1' is ready
Probing TCP socket on localhost:64964 of 'peppa_1'
TCP socket on localhost:64964 of 'peppa_1' is ready
+---------+----------------+-----------------+
| Name    | Container Port | Mapping         |
+---------+----------------+-----------------+
| hdfs_1  | 4444           | localhost:64965 |
+---------+----------------+-----------------+
| peppa_1 | 4444           | localhost:64964 |
+---------+----------------+-----------------+

BUILD SUCCESSFUL in 14s
10 actionable tasks: 2 executed, 8 up-to-date

$ docker ps -a
CONTAINER ID   IMAGE                                                     COMMAND                  CREATED          STATUS          PORTS                                                    NAMES
bf9f1be8d8c4   7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa   "bash /fixture/src/m…"   10 minutes ago   Up 10 minutes   88/tcp, 0.0.0.0:59405->88/udp, 0.0.0.0:64964->4444/tcp   7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__peppa_1
b05aaa9c806f   7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs    "bash /fixture/src/m…"   10 minutes ago   Up 10 minutes   88/tcp, 0.0.0.0:54204->88/udp, 0.0.0.0:64965->4444/tcp   7aa8ceb5208c2f5bd2cf0cb3e4931833_krb5kdc-fixture__hdfs_1

$ docker exec bf9f1be8d8c4 cat /etc/hosts
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.25.0.2	kerberos.build.opensearch.org kerberos

$ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' bf9f1be8d8c4
172.25.0.2

$ docker exec b05aaa9c806f cat /etc/hosts
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.25.0.3	kerberos.build.opensearch.org kerberos

$ docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' b05aaa9c806f
172.25.0.3