Run proxysql with proxysql user

This patch is switching root user to
proxysql user and provides some
necessary changes to work.

Change-Id: Id603cc1e9c084eac8afc4c6d2ddde9a1f4fe6728

docker/proxysql/Dockerfile.j2

@@ -26,10 +26,16 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {{ macros.configure_user(name='proxysql') }}
 {{ macros.install_packages(proxysql_packages | customizable("packages")) }}
 
-COPY kolla_proxysql_start kolla_proxysql_config_sync kolla_extend_start /usr/local/bin/
-RUN chmod 755 /usr/local/bin/kolla_proxysql_start \
-    && chmod 755 /usr/local/bin/kolla_proxysql_config_sync \
+COPY kolla_proxysql_config_sync kolla_extend_start /usr/local/bin/
+RUN chmod 755 /usr/local/bin/kolla_proxysql_config_sync \
     && chmod 644 /usr/local/bin/kolla_extend_start
 
+RUN install -g proxysql -o proxysql -m 770 -d /var/lib/kolla/proxysql \
+    && touch /etc/proxysql.cnf \
+    && chown proxysql:proxysql /etc/proxysql.cnf \
+    && chmod 600 /etc/proxysql.cnf
+
 {% block proxysql_footer %}{% endblock %}
 {% block footer %}{% endblock %}
+
+USER proxysql

docker/proxysql/kolla_proxysql_config_sync

@@ -136,8 +136,8 @@ class ProxySQLConfig:
 
     def write_config(self):
         LOG.info("Writing config to {}".format(self.conf_file))
-        if os.path.exists(self.conf_file):
-            os.remove(self.conf_file)
+        with open(self.conf_file, 'wb') as f:
+            pass
         for k, v in self.config.items():
             if isinstance(v, dict):
                 self._write_dict(k, v)

docker/proxysql/kolla_proxysql_start

@@ -1,9 +0,0 @@
-#!/bin/bash
-
-PROXYSQL_LOG_FILE="/var/log/kolla/proxysql/proxysql.log"
-
-proxysql \
-    --exit-on-error \
-    --idle-threads \
-    --no-version-check \
-    -f -D /var/lib/proxysql -c /etc/proxysql.cnf >> ${PROXYSQL_LOG_FILE} 2>&1