I just migrated a wordpress blog on a new server. He has about 120,000 messages.
The problem is that it is hit, hangs or even hangs when using mysql.
One word post operation (without plug-in) create post consumes 60 to 80% of the CPU. And when to perform 3-5 database operation it will freeze
And there is no log for a slow query.
System: Ubuntu 18.04 with 16 GB of RAM, 8 Core processors, 120 GB of disk and MySQL version 5.7.25
Here is mysqltuner and other reports
and mysql.cnf current
[mysqld] # Ignore reverse DNS lookup of clients skip-name-resol default-storage-engine = InnoDB max_allowed_packet = 500M max_connections = 256 # wait_timeout = 60 innodb_file_per_table = 1 innodb_buffer_pool_size = 4G innodb_buffer_pool_instances = 4 innodb_log_file_size = 512M innodb_flush_log_at_trx_commit = 1 innodb_flush_method = O_DIRECT innodb_open_files = 5000 innodb_io_capacity = 2000 innodb_io_capacity_max = 4000 innodb_old_blocks_time = 2000 open_files_limit = 50000 query_cache_type = 1 query_cache_min_res_unit = 1M query_cache_limit = 8M query_cache_size = 512M tmp_table_size = 256M max_heap_table_size = 256M #key_buffer_size = 128M thread_stack = 128K thread_cache_size = 32 slow-query-log = 1 slow-query-log-file = /var/lib/mysql/mysql-slow.log long_query_time = 1