我的wordpress网站每天有500个访问者。 我之前在共享主机上。但是在托管公司的系统管理员发出警告后转移它。
我从digitalocean购买了512 ssd云。我试了几个月，但在粉碎后我把它变成了webmin。现在，每天我的服务器因内存而崩溃。
我无法得到它。它每天只有0.5k的访客。通常服务器使用％59内存和％0 cpu。但是mysql使用了大量的内存，我不知道这是正常的吗？ mysql的内存使用量在285mb到350mb之间。当它看到更多时，服务器就会崩溃。那是正常的吗？
我在wp上安装了这个插件; WP Rocket，Yoast SEO。我使用WP-DBManager来优化数据库，但没有任何改变。
我只是想知道，对于使用该插件的0.5k wp网站来说，这是正常的。
我该怎么办这个问题？我很抱歉我的英语不好。
System Details: 512 MB Memory / 20 GB Disk / - Ubuntu 12.04.5 x32
Webmin version 1.801
Virtualmin version 5.03
Kernel and CPU Linux 3.13.0-85-generic on i686
Processor information Intel(R) Xeon(R) CPU E5-2650L v3 @ 1.80GHz, 1 cores
CPU load averages 0.04 (1 min) 0.05 (5 mins) 0.05 (15 mins)
Real memory 483.42 MB total / 319.32 MB used
Virtual memory 0 bytes total / 0 bytes used
Local disk space 19.56 GB total / 14.97 GB free / 4.60 GB used
free -m
total used free shared buffers cached
Mem: 495 387 107 0 12 58
-/+ buffers/cache: 316 178
Swap: 0 0 0
在my.cnf
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
bind-address = 127.0.0.1
key_buffer = 16M
max_allowed_packet = 1M
myisam-recover = BACKUP
query_cache_limit = 1M
log_error = /var/log/mysql/error.log
expire_logs_days = 10
max_binlog_size = 100M
innodb_file_per_table = 1
read_rnd_buffer_size = 256K
net_buffer_length = 2K
read_buffer_size = 256K
sort_buffer_size = 64K
table_open_cache = 4
key_buffer_size = 16K
thread_stack = 128K
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
[isamchk]
key_buffer = 16M
sort_buffer_size = 8M
key_buffer_size = 8M
!includedir /etc/mysql/conf.d/
Webmin mysql系统变量
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
back_log 50
basedir /usr
big_tables OFF
binlog_cache_size 32768
binlog_direct_non_transactional_updates OFF
binlog_format STATEMENT
binlog_stmt_cache_size 32768
bulk_insert_buffer_size 8388608
character_set_client latin1
character_set_connection latin1
character_set_database latin1
character_set_filesystem binary
character_set_results latin1
character_set_server latin1
character_set_system utf8
character_sets_dir /usr/share/mysql/charsets/
collation_connection latin1_swedish_ci
collation_database latin1_swedish_ci
collation_server latin1_swedish_ci
completion_type NO_CHAIN
concurrent_insert AUTO
connect_timeout 10
datadir /var/lib/mysql/
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
default_storage_engine InnoDB
default_week_format 0
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
div_precision_increment 4
engine_condition_pushdown ON
error_count 0
event_scheduler OFF
expire_logs_days 10
external_user
flush OFF
flush_time 0
foreign_key_checks ON
ft_boolean_syntax + -><()~*:""&|
ft_max_word_len 84
ft_min_word_len 4
ft_query_expansion_limit 20
ft_stopword_file (built-in)
general_log OFF
general_log_file /var/lib/mysql/ns1.log
group_concat_max_len 1024
have_compress YES
have_crypt YES
have_csv YES
have_dynamic_loading YES
have_geometry YES
have_innodb YES
have_ndbcluster NO
have_openssl DISABLED
have_partitioning YES
have_profiling YES
have_query_cache YES
have_rtree_keys YES
have_ssl DISABLED
have_symlink YES
hostname myhostname
identity 0
ignore_builtin_innodb OFF
init_connect
init_file
init_slave
innodb_adaptive_flushing ON
innodb_adaptive_hash_index ON
innodb_additional_mem_pool_size 8388608
innodb_autoextend_increment 8
innodb_autoinc_lock_mode 1
innodb_buffer_pool_instances 1
innodb_buffer_pool_size 134217728
innodb_change_buffering all
innodb_checksums ON
innodb_commit_concurrency 0
innodb_concurrency_tickets 500
innodb_data_file_path ibdata1:10M:autoextend
innodb_data_home_dir
innodb_doublewrite ON
innodb_fast_shutdown 1
innodb_file_format Antelope
innodb_file_format_check ON
innodb_file_format_max Antelope
innodb_file_per_table ON
innodb_flush_log_at_trx_commit 1
innodb_flush_method
innodb_force_load_corrupted OFF
innodb_force_recovery 0
innodb_io_capacity 200
innodb_large_prefix OFF
innodb_lock_wait_timeout 50
innodb_locks_unsafe_for_binlog OFF
innodb_log_buffer_size 8388608
innodb_log_file_size 5242880
innodb_log_files_in_group 2
innodb_log_group_home_dir ./
innodb_max_dirty_pages_pct 75
innodb_max_purge_lag 0
innodb_mirrored_log_groups 1
innodb_old_blocks_pct 37
innodb_old_blocks_time 0
innodb_open_files 300
innodb_print_all_deadlocks OFF
innodb_purge_batch_size 20
innodb_purge_threads 0
innodb_random_read_ahead OFF
innodb_read_ahead_threshold 56
innodb_read_io_threads 4
innodb_replication_delay 0
innodb_rollback_on_timeout OFF
innodb_rollback_segments 128
innodb_spin_wait_delay 6
innodb_stats_method nulls_equal
innodb_stats_on_metadata ON
innodb_stats_sample_pages 8
innodb_strict_mode OFF
innodb_support_xa ON
innodb_sync_spin_loops 30
innodb_table_locks ON
innodb_thread_concurrency 0
innodb_thread_sleep_delay 10000
innodb_use_native_aio OFF
innodb_use_sys_malloc ON
innodb_version 5.5.49
innodb_write_io_threads 4
insert_id 0
interactive_timeout 28800
join_buffer_size 131072
keep_files_on_create OFF
key_buffer_size 16384
key_cache_age_threshold 300
key_cache_block_size 1024
key_cache_division_limit 100
large_files_support ON
large_page_size 0
large_pages OFF
last_insert_id 0
lc_messages en_US
lc_messages_dir /usr/share/mysql/
lc_time_names en_US
license GPL
local_infile ON
lock_wait_timeout 31536000
locked_in_memory OFF
log OFF
log_bin OFF
log_bin_trust_function_creators OFF
log_error /var/log/mysql/error.log
log_output FILE
log_queries_not_using_indexes OFF
log_slave_updates OFF
log_slow_queries OFF
log_warnings 1
long_query_time 10.000000
low_priority_updates OFF
lower_case_file_system OFF
lower_case_table_names 0
max_allowed_packet 1048576
max_binlog_cache_size 18446744073709547520
max_binlog_size 104857600
max_binlog_stmt_cache_size 18446744073709547520
max_connect_errors 10
max_connections 151
max_delayed_threads 20
max_error_count 64
max_heap_table_size 16777216
max_insert_delayed_threads 20
max_join_size 18446744073709551615
max_length_for_sort_data 1024
max_long_data_size 1048576
max_prepared_stmt_count 16382
max_relay_log_size 0
max_seeks_for_key 4294967295
max_sort_length 1024
max_sp_recursion_depth 0
max_tmp_tables 32
max_user_connections 0
max_write_lock_count 4294967295
metadata_locks_cache_size 1024
min_examined_row_limit 0
multi_range_count 256
myisam_data_pointer_size 6
myisam_max_sort_file_size 2146435072
myisam_mmap_size 4294967295
myisam_recover_options BACKUP
myisam_repair_threads 1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
myisam_use_mmap OFF
net_buffer_length 2048
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
new OFF
old OFF
old_alter_table OFF
old_passwords OFF
open_files_limit 1024
optimizer_prune_level 1
optimizer_search_depth 62
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
performance_schema OFF
performance_schema_events_waits_history_long_size 10000
performance_schema_events_waits_history_size 10
performance_schema_max_cond_classes 80
performance_schema_max_cond_instances 1000
performance_schema_max_file_classes 50
performance_schema_max_file_handles 32768
performance_schema_max_file_instances 10000
performance_schema_max_mutex_classes 200
performance_schema_max_mutex_instances 1000000
performance_schema_max_rwlock_classes 30
performance_schema_max_rwlock_instances 1000000
performance_schema_max_table_handles 100000
performance_schema_max_table_instances 50000
performance_schema_max_thread_classes 50
performance_schema_max_thread_instances 1000
pid_file /var/run/mysqld/mysqld.pid
plugin_dir /usr/lib/mysql/plugin/
port 3306
preload_buffer_size 32768
profiling OFF
profiling_history_size 15
protocol_version 10
proxy_user
pseudo_slave_mode OFF
pseudo_thread_id 579
query_alloc_block_size 8192
query_cache_limit 1048576
query_cache_min_res_unit 4096
query_cache_size 0
query_cache_type ON
query_cache_wlock_invalidate OFF
query_prealloc_size 8192
rand_seed1 0
rand_seed2 0
range_alloc_block_size 4096
read_buffer_size 262144
read_only OFF
read_rnd_buffer_size 262144
relay_log
relay_log_index
relay_log_info_file relay-log.info
relay_log_purge ON
relay_log_recovery OFF
relay_log_space_limit 0
report_host
report_password
report_port 3306
report_user
rpl_recovery_rank 0
secure_auth OFF
secure_file_priv
server_id 0
skip_external_locking ON
skip_name_resolve OFF
skip_networking OFF
skip_show_database OFF
slave_compressed_protocol OFF
slave_exec_mode STRICT
slave_load_tmpdir /tmp
slave_max_allowed_packet 1073741824
slave_net_timeout 3600
slave_skip_errors OFF
slave_transaction_retries 10
slave_type_conversions
slow_launch_time 2
slow_query_log OFF
slow_query_log_file /var/lib/mysql/ns1-slow.log
socket /var/run/mysqld/mysqld.sock
sort_buffer_size 65536
sql_auto_is_null OFF
sql_big_selects ON
sql_big_tables OFF
sql_buffer_result OFF
sql_log_bin ON
sql_log_off OFF
sql_low_priority_updates OFF
sql_max_join_size 18446744073709551615
sql_mode
sql_notes ON
sql_quote_show_create ON
sql_safe_updates OFF
sql_select_limit 18446744073709551615
sql_slave_skip_counter 0
sql_warnings OFF
ssl_ca
ssl_capath
ssl_cert
ssl_cipher
ssl_key
storage_engine InnoDB
stored_program_cache 256
sync_binlog 0
sync_frm ON
sync_master_info 0
sync_relay_log 0
sync_relay_log_info 0
system_time_zone EEST
table_definition_cache 400
table_open_cache 4
thread_cache_size 0
thread_concurrency 10
thread_handling one-thread-per-connection
thread_stack 131072
time_format %H:%i:%s
time_zone SYSTEM
timed_mutexes OFF
timestamp 1465490671
tmp_table_size 16777216
tmpdir /tmp
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
tx_isolation REPEATABLE-READ
unique_checks ON
updatable_views_with_limit YES
version 5.5.49-0ubuntu0.12.04.1
version_comment (Ubuntu)
version_compile_machine i686
version_compile_os debian-linux-gnu
wait_timeout 28800
warning_count 0
正在运行的流程
1055 mysql 287.15 MB /usr/sbin/mysqld
1789 ajnasite 95.90 MB /usr/bin/php5-cgi
1860 ajnasite 95.52 MB /usr/bin/php5-cgi
1734 ajnasite 88.77 MB /usr/bin/php5-cgi
1032 bind 50.98 MB /usr/sbin/named -u bind
5631 www-data 47.72 MB /usr/sbin/apache2 -k start
1874 www-data 47.71 MB /usr/sbin/apache2 -k start
1864 www-data 47.71 MB /usr/sbin/apache2 -k start
5642 www-data 47.69 MB /usr/sbin/apache2 -k start
5650 www-data 47.67 MB /usr/sbin/apache2 -k start
7035 www-data 47.66 MB /usr/sbin/apache2 -k start
1733 www-data 47.65 MB /usr/sbin/apache2 -k start
7650 www-data 47.64 MB /usr/sbin/apache2 -k start
8296 www-data 47.62 MB /usr/sbin/apache2 -k start
8107 www-data 47.61 MB /usr/sbin/apache2 -k start
1688 root 46.89 MB /usr/sbin/apache2 -k start
8451 root 46.73 MB /usr/share/webmin/proc/index_size.cgi
508 syslog 29.45 MB rsyslogd -c5
1693 www-data 25.31 MB /usr/sbin/apache2 -k start
1036 whoopsie 23.90 MB whoopsie
1199 clamav 17.69 MB /usr/bin/freshclam -d --quiet
1736 root 16.86 MB /usr/bin/perl /usr/share/webmin/miniserv.pl /etc/webmin/miniserv.conf
8444 root 16.86 MB /usr/bin/perl /usr/share/webmin/miniserv.pl /etc/webmin/miniserv.conf
1626 root 15.21 MB /usr/bin/perl /usr/share/usermin/miniserv.pl /etc/usermin/miniserv.conf
1339 root 12.02 MB /usr/sbin/saslauthd -a pam -m /var/spool/postfix/var/run/saslauthd -r -n 5
1340 root 12.02 MB /usr/sbin/saslauthd -a pam -m /var/spool/postfix/var/run/saslauthd -r -n 5
1341 root 12.02 MB /usr/sbin/saslauthd -a pam -m /var/spool/postfix/var/run/saslauthd -r -n 5
1342 root 12.02 MB /usr/sbin/saslauthd -a pam -m /var/spool/postfix/var/run/saslauthd -r -n 5
1343 root 12.02 MB /usr/sbin/saslauthd -a pam -m /var/spool/postfix/var/run/saslauthd -r -n 5
7448 root 10.65 MB -bash
7252 root 9.46 MB sshd: root@pts/0
1644 proftpd 9.27 MB proftpd: (accepting connections)
8517 root 7.84 MB sshd: [accepted]
8518 sshd 7.84 MB sshd: [net]
8290 postfix 7.80 MB smtpd -n smtp -t inet -u -c -o stress= -s 2 -o smtpd_sasl_auth_enable=yes
1890 postfix 7.02 MB tlsmgr -l -t unix -u -c
5890 postfix 6.97 MB smtp -t unix -u -c
818 root 6.52 MB /usr/sbin/sshd -D
5889 postfix 4.93 MB cleanup -z -t unix -u -c
7661 root 4.79 MB nano my.cnf
7695 root 4.79 MB nano my.cnf
8165 root 4.79 MB nano my.cnf
6020 postfix 4.67 MB trivial-rewrite -n rewrite -t unix -u -c
1312 postfix 4.53 MB qmgr -l -t fifo -u
973 root 4.52 MB /sbin/getty -8 38400 tty4
980 root 4.52 MB /sbin/getty -8 38400 tty5
987 root 4.52 MB /sbin/getty -8 38400 tty2
988 root 4.52 MB /sbin/getty -8 38400 tty3
996 root 4.52 MB /sbin/getty -8 38400 tty6
1741 root 4.52 MB /sbin/getty -8 38400 tty1
5892 postfix 4.51 MB bounce -z -t unix -u -c
5901 postfix 4.48 MB pickup -l -t fifo -u -c
8292 postfix 4.48 MB anvil -l -t unix -u -c
1304 root 4.46 MB /usr/lib/postfix/master
1 root 3.45 MB /sbin/init
497 messagebus 3.18 MB dbus-daemon --system --fork --activation=upstart
1015 root 2.93 MB /usr/sbin/dovecot -F -c /etc/dovecot/dovecot.conf
493 root 2.90 MB /sbin/udevd --daemon
572 root 2.89 MB /sbin/udevd --daemon
573 root 2.89 MB /sbin/udevd --daemon
8522 root 2.79 MB ps --cols 2048 -eo user:80,ruser:80,group:80,rgroup:80,pid,ppid,pgid,pcpu,vsz,ni ...
850 root 2.78 MB upstart-socket-bridge --daemon
470 root 2.77 MB upstart-udev-bridge --daemon
1042 dovecot 2.66 MB dovecot/anvil
1043 root 2.65 MB dovecot/log
1018 root 2.55 MB cron
1691 root 2.50 MB /usr/sbin/htcacheclean -d120 -i -p/var/cache/apache2/mod_disk_cache -l300M
1019 daemon 2.41 MB atd
8521 root 2.18 MB sh -c ps --cols 2048 -eo user:80,ruser:80,group:80,rgroup:80,pid,ppid,pgid,pcpu, ...
1017 root 2.13 MB acpid -c /etc/acpi/events -s /var/run/acpid.socket
2 root 0 kB [kthreadd]
3 root 0 kB [ksoftirqd/0]
5 root 0 kB [kworker/0:0H]
6 root 0 kB [kworker/u2:0]
7 root 0 kB [rcu_sched]
8 root 0 kB [rcu_bh]
9 root 0 kB [migration/0]
10 root 0 kB [watchdog/0]
11 root 0 kB [khelper]
12 root 0 kB [kdevtmpfs]
13 root 0 kB [netns]
14 root 0 kB [writeback]
15 root 0 kB [kintegrityd]
16 root 0 kB [bioset]
17 root 0 kB [kworker/u3:0]
18 root 0 kB [kblockd]
19 root 0 kB [ata_sff]
20 root 0 kB [khubd]
21 root 0 kB [md]
22 root 0 kB [devfreq_wq]
23 root 0 kB [kworker/0:1]
25 root 0 kB [khungtaskd]
26 root 0 kB [kswapd0]
27 root 0 kB [vmstat]
28 root 0 kB [ksmd]
29 root 0 kB [fsnotify_mark]
30 root 0 kB [ecryptfs-kthrea]
31 root 0 kB [crypto]
43 root 0 kB [kthrotld]
45 root 0 kB [vballoon]
46 root 0 kB [scsi_eh_0]
47 root 0 kB [scsi_eh_1]
67 root 0 kB [deferwq]
68 root 0 kB [charger_manager]
211 root 0 kB [jbd2/vda1-8]
212 root 0 kB [ext4-rsv-conver]
222 root 0 kB [scsi_eh_2]
679 root 0 kB [kpsmoused]
691 root 0 kB [ttm_swap]
703 root 0 kB [kworker/0:2]
858 root 0 kB [kvm-irqfd-clean]
1821 root 0 kB [kworker/u3:1]
7944 root 0 kB [kworker/u2:2]
我使用mysqlcheck -uroot -p too
优化了db答案 0 :(得分：1)
问题是缺少RAM，因为我错过了swap partition。
对于有相同问题的人，我使用这篇文章来添加swap：
https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-12-04