Move docker-specific [mysqld] additions to their own "docker.cnf" file

Author: tianon

5.6/Dockerfile

@@ -51,8 +51,7 @@ RUN { \
 # comment out a few problematic configuration values
 # don't reverse lookup hostnames, they are usually another container
 RUN sed -Ei 's/^(bind-address|log)/#&/' /etc/mysql/my.cnf \
-	&& echo 'skip-host-cache\nskip-name-resolve' | awk '{ print } $1 == "[mysqld]" && c == 0 { c = 1; system("cat") }' /etc/mysql/my.cnf > /tmp/my.cnf \
-	&& mv /tmp/my.cnf /etc/mysql/my.cnf
+	&& echo '[mysqld]\nskip-host-cache\nskip-name-resolve' > /etc/mysql/conf.d/docker.cnf
 
 VOLUME /var/lib/mysql
 

5.7/Dockerfile

@@ -51,8 +51,7 @@ RUN { \
 # comment out a few problematic configuration values
 # don't reverse lookup hostnames, they are usually another container
 RUN sed -Ei 's/^(bind-address|log)/#&/' /etc/mysql/mysql.conf.d/mysqld.cnf \
-	&& echo 'skip-host-cache\nskip-name-resolve' | awk '{ print } $1 == "[mysqld]" && c == 0 { c = 1; system("cat") }' /etc/mysql/mysql.conf.d/mysqld.cnf > /tmp/mysqld.cnf \
-	&& mv /tmp/mysqld.cnf /etc/mysql/mysql.conf.d/mysqld.cnf
+	&& echo '[mysqld]\nskip-host-cache\nskip-name-resolve' > /etc/mysql/conf.d/docker.cnf
 
 VOLUME /var/lib/mysql
 

8.0/Dockerfile

@@ -51,8 +51,7 @@ RUN { \
 # comment out a few problematic configuration values
 # don't reverse lookup hostnames, they are usually another container
 RUN sed -Ei 's/^(bind-address|log)/#&/' /etc/mysql/mysql.conf.d/mysqld.cnf \
-	&& echo 'skip-host-cache\nskip-name-resolve' | awk '{ print } $1 == "[mysqld]" && c == 0 { c = 1; system("cat") }' /etc/mysql/mysql.conf.d/mysqld.cnf > /tmp/mysqld.cnf \
-	&& mv /tmp/mysqld.cnf /etc/mysql/mysql.conf.d/mysqld.cnf
+	&& echo '[mysqld]\nskip-host-cache\nskip-name-resolve' > /etc/mysql/conf.d/docker.cnf
 
 VOLUME /var/lib/mysql