set binlog config in mysql

keep max binlog file size to 100M. and rotate then in 10 days

setup/start.sh

@@ -178,7 +178,11 @@ systemctl start nginx
 # restart mysql to make sure it has latest config
 if [[ ! -f /etc/mysql/mysql.cnf ]] || ! diff -q "${script_dir}/start/mysql.cnf" /etc/mysql/mysql.cnf >/dev/null; then
     # wait for all running mysql jobs
-    cp "${script_dir}/start/mysql.cnf" /etc/mysql/mysql.cnf
+    if [[ "${ubuntu_version}" == "20.04" ]]; then
+        cp "${script_dir}/start/mysql/8.0.cnf" /etc/mysql/mysql.cnf
+    else
+        cp "${script_dir}/start/mysql/5.7.cnf" /etc/mysql/mysql.cnf
+    fi
     while true; do
         if ! systemctl list-jobs | grep mysql; then break; fi
         echo "Waiting for mysql jobs..."

setup/start/mysql/5.7.cnf

@@ -15,6 +15,10 @@ collation-server = utf8mb4_unicode_ci
 # set timezone to UTC
 default_time_zone='+00:00'
 
+# keep mysql binlogs under check
+expire_logs_days        = 10
+max_binlog_size   = 100M
+
 [mysqldump]
 quick
 quote-names

setup/start/mysql/8.0.cnf

@@ -0,0 +1,33 @@
+!includedir /etc/mysql/conf.d/
+!includedir /etc/mysql/mysql.conf.d/
+
+# http://bugs.mysql.com/bug.php?id=68514
+[mysqld]
+performance_schema=OFF
+max_connections=50
+# on ec2, without this we get a sporadic connection drop when doing the initial migration
+max_allowed_packet=64M
+
+# https://mathiasbynens.be/notes/mysql-utf8mb4
+character-set-server = utf8mb4
+collation-server = utf8mb4_unicode_ci
+
+# set timezone to UTC
+default_time_zone='+00:00'
+
+# keep mysql binlogs under check
+binlog_expire_logs_seconds = 864000
+max_binlog_size   = 100M
+
+[mysqldump]
+quick
+quote-names
+max_allowed_packet  = 16M
+default-character-set = utf8mb4
+
+[mysql]
+default-character-set = utf8mb4
+
+[client]
+default-character-set = utf8mb4
+