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    你的位置：在路上 > 工作和技术 > ProgrammingLanguage > PHP > WordPress > 【已解决】WordPress的PHP的log日志出现：PHP message RedisException OOM command not allowed when used memory maxmemory in plugins redis-cache

    【已解决】WordPress的PHP的log日志出现：PHP message RedisException OOM command not allowed when used memory maxmemory in plugins redis-cache

    WordPress crifan 2064浏览 0评论
    折腾：
    【未解决】去修复WordPress登录页死循环：去看php的log日志
    期间，去看看php的log，其中发现：
    [root@crifan log]# tail php-fpm.log
PHP message: PHP Deprecated:  在d_textbanner中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: RedisException: OOM command not allowed when used memory > 'maxmemory'. in /data/wwwroot/www.crifan.com/wp-content/plugins/redis-cache/includes/class-plugin.php:898"
Stack trace:"
#0 /data/wwwroot/www.crifan.com/wp-content/plugins/redis-cache/includes/class-plugin.php(898): Redis->zAdd('wp:redis-cache:...', 1604106870, 'i=7644e3c;h=464...')"
#1 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(287): Rhubarb\RedisCache\Plugin->record_metrics('')"
#2 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)"
#3 /data/wwwroot/www.crifan.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array)"
#4 /data/wwwroot/www.crifan.com/wp-includes/load.php(1007): do_action('shutdown')"
#5 [internal function]: shutdown_action_hook()"
#6 {main}"
    看起来是：
    PHP message: RedisException: OOM command not allowed when used memory > 'maxmemory'
    和redis有关，且OOM是out of memory，内存不够用了？
    或许就是redis导致cookie没法正常保存，无法登录的？
    不过去看看更多行的log：
    [root@crifan log]# tail -n 40 php-fpm.log 
PHP message: RedisException: OOM command not allowed when used memory > 'maxmemory'. in /data/wwwroot/www.crifan.com/wp-content/object-cache.php:1570"
Stack trace:"
#0 /data/wwwroot/www.crifan.com/wp-content/object-cache.php(1570): Redis->set('wp:transient:do...', '1604106893.6660...')"
#1 /data/wwwroot/www.crifan.com/wp-content/object-cache.php(203): WP_Object_Cache->set('doing_cron', '1604106893.6660...', 'transient', 0)"
#2 /data/wwwroot/www.crifan.com/wp-includes/option.php(875): wp_cache_set('doing_cron', '1604106893.6660...', 'transient', 0)"
#3 /data/wwwroot/www.crifan.com/wp-includes/cron.php(691): set_transient('doing_cron', '1604106893.6660...')"
#4 /data/wwwroot/www.crifan.com/wp-includes/cron.php(774): spawn_cron(1604106893.6661)"
#5 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(287): wp_cron('')"
#6 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)"
#7 /data/wwwroot/www.crifan.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array)"
#8 ..."
PHP message: PHP Notice:  Undefined variable: wp_sh_class_name in /data/wwwroot/www.crifan.com/wp-content/plugins/wp-syntaxhighlighter/wp-syntaxhighlighter.php on line 1002"
PHP message: PHP Notice:  Undefined variable: wp_sh_class_name in /data/wwwroot/www.crifan.com/wp-content/plugins/wp-syntaxhighlighter/wp-syntaxhighlighter.php on line 1002"
PHP message: PHP Warning:  Use of undefined constant XML - assumed 'XML' (this will throw an Error in a future version of PHP) in /data/wwwroot/www.crifan.com/wp-content/plugins/wp-syntaxhighlighter/wp-syntaxhighlighter.php on line 1048"
PHP message: PHP Notice:  wp_deregister_script的调用方法<strong>不正确</strong>。脚本和样式应在<code>wp_enqueue_scripts</code>、<code>admin_enqueue_scripts</code>和<code>login_enqueue_scripts</code>钩子之后再加入加载队列（enqueue）或注册（register）。 This notice was triggered by the <code>l10n</code> handle. 请查阅<a href="https://wordpress.org/support/article/debugging-in-wordpress/">调试WordPress</a>来获取更多信息。 （这个消息是在3.3.0版本添加的。） in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 5225"
PHP message: PHP Warning:  Use of undefined constant DESC - assumed 'DESC' (this will throw an Error in a future version of PHP) in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/404.php on line 10"
PHP message: PHP Deprecated:  自3.1.0版本起，已<strong>不建议</strong>给WP_Query传入一个参数！<code>caller_get_posts</code>已被废弃，请改用<code>ignore_sticky_posts</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 5057"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-banner.php on line 11"
PHP message: PHP Deprecated:  在d_banner中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-slidebanner.php on line 11"
PHP message: PHP Deprecated:  在d_slidebanner中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-readers.php on line 11"
PHP message: PHP Deprecated:  在d_reader中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-postlist.php on line 11"
PHP message: PHP Deprecated:  在d_postlist中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-comment.php on line 11"
PHP message: PHP Deprecated:  在d_comment中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-tags.php on line 11"
PHP message: PHP Deprecated:  在d_tag中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: PHP Notice:  Undefined variable: control_ops in /data/wwwroot/www.crifan.com/wp-content/themes/daqianduan-d8-jquiss/widgets/wid-textbanner.php on line 11"
PHP message: PHP Deprecated:  在d_textbanner中为WP_Widget调用的构造函数已自版本4.3.0起<strong>废弃</strong>！请改用<code>__construct()</code>。 in /data/wwwroot/www.crifan.com/wp-includes/functions.php on line 4866"
PHP message: RedisException: OOM command not allowed when used memory > 'maxmemory'. in /data/wwwroot/www.crifan.com/wp-content/plugins/redis-cache/includes/class-plugin.php:898"
Stack trace:"
#0 /data/wwwroot/www.crifan.com/wp-content/plugins/redis-cache/includes/class-plugin.php(898): Redis->zAdd('wp:redis-cache:...', 1604106893, 'i=8db1692;h=464...')"
#1 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(287): Rhubarb\RedisCache\Plugin->record_metrics('')"
#2 /data/wwwroot/www.crifan.com/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)"
#3 /data/wwwroot/www.crifan.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array)"
#4 /data/wwwroot/www.crifan.com/wp-includes/load.php(1007): do_action('shutdown')"
#5 [internal function]: shutdown_action_hook()"
#6 {main}"
    除了中间的php的提示，好像就只是此处的 RedisException: OOM 的问题了。
    wordpress RedisException OOM
    WordPress排查解决您的站点遇到了致命错误的过程-Redis内存缓存不足 – 全部 – 真不是你的
    #0 /data/wwwroot/www.crifan.com/wp-content/plugins/redis-cache/includes/class-plugin.php(898): Redis->zAdd('wp:redis-cache:...', 1604106893, 'i=8db1692;h=464...')"
    此处直接的原因就是：
    redis-cache
    [root@crifan log]# redis-cli
127.0.0.1:6379> info memory
# Memory
used_memory:473004392
used_memory_human:451.09M
used_memory_rss:495353856
used_memory_rss_human:472.41M
used_memory_peak:478294600
used_memory_peak_human:456.14M
used_memory_peak_perc:98.89%
used_memory_overhead:80705822
used_memory_startup:791200
used_memory_dataset:392298570
used_memory_dataset_perc:83.08%
allocator_allocated:473418200
allocator_active:482840576
allocator_resident:497201152
total_system_memory:3973521408
total_system_memory_human:3.70G
used_memory_lua:37888
used_memory_lua_human:37.00K
used_memory_scripts:0
used_memory_scripts_human:0B
number_of_cached_scripts:0
maxmemory:473000000
maxmemory_human:451.09M
maxmemory_policy:noeviction
allocator_frag_ratio:1.02
allocator_frag_bytes:9422376
allocator_rss_ratio:1.03
allocator_rss_bytes:14360576
rss_overhead_ratio:1.00
rss_overhead_bytes:-1847296
mem_fragmentation_ratio:1.05
mem_fragmentation_bytes:22390488
mem_not_counted_for_evict:0
mem_replication_backlog:0
mem_clients_slaves:0
mem_clients_normal:49694
mem_aof_buffer:0
mem_allocator:jemalloc-5.1.0
active_defrag_running:0
lazyfree_pending_objects:0
127.0.0.1:6379>
    其中：
    • used_memory_human:451.09M
    • maxmemory_human:451.09M
    的确是已占用完毕了。
    去调整：
    vi /usr/local/redis/etc/redis.conf
    去看看原先内容
    Vultr/usr/local/redis/etc/redis.conf
    maxmemory 473000000
    -》
    473000000 = 451.08795166015625 MB
    -》的确是上面的结果：used_memory_human 已经用的内容，超过了 最大的内存maxmemory_human
    去改大点，比如1G
    # maxmemory 473000000
maxmemory 1073741824
    以及：
    # MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
# is reached. You can select among five behaviors:
#
# volatile-lru -> Evict using approximated LRU among the keys with an expire set.
# allkeys-lru -> Evict any key using approximated LRU.
# volatile-lfu -> Evict using approximated LFU among the keys with an expire set.
# allkeys-lfu -> Evict any key using approximated LFU.
# volatile-random -> Remove a random key among the ones with an expire set.
# allkeys-random -> Remove a random key, any key.
# volatile-ttl -> Remove the key with the nearest expire time (minor TTL)
# noeviction -> Don't evict anything, just return an error on write operations.
#
# LRU means Least Recently Used
# LFU means Least Frequently Used
#
# Both LRU, LFU and volatile-ttl are implemented using approximated
# randomized algorithms.
#
# Note: with any of the above policies, Redis will return an error on write
#       operations, when there are no suitable keys for eviction.
#
#       At the date of writing these commands are: set setnx setex append
#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
#       getset mset msetnx exec sort
#
# The default is:
#
# maxmemory-policy noeviction
    去改为：
    # maxmemory-policy noeviction
maxmemory-policy volatile-lru
    然后重启redis：
    service redis-server restart
    不过重启之前，删除php的log：
    [root@crifan log]# cd /usr/local/php/var/log/
[root@crifan log]# lh
total 5.8G
-rw------- 1 root root 5.8G Oct 31 09:29 php-fpm.log
[root@crifan log]# rm -rf php-fpm.log
[root@crifan log]# lh
total 0
    这样后续更方便调试，找到最新的log
    [root@crifan log]# service redis-server restart
Redirecting to /bin/systemctl restart redis-server.service
    再去确保redis正常运行了：
    [root@crifan log]# service redis-server status
Redirecting to /bin/systemctl status redis-server.service
● redis-server.service - Redis In-Memory Data Store
   Loaded: loaded (/usr/lib/systemd/system/redis-server.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2020-10-31 09:30:37 CST; 17s ago
  Process: 11169 ExecStop=/bin/kill -s TERM $MAINPID (code=exited, status=0/SUCCESS)
  Process: 11180 ExecStart=/usr/local/redis/bin/redis-server /usr/local/redis/etc/redis.conf (code=exited, status=0/SUCCESS)
  Process: 11177 ExecStartPre=/bin/chown -R redis:redis ${statedir} (code=exited, status=0/SUCCESS)
  Process: 11175 ExecStartPre=/bin/mkdir -p ${statedir} (code=exited, status=0/SUCCESS)
 Main PID: 11183 (redis-server)
   CGroup: /system.slice/redis-server.service
           └─11183 /usr/local/redis/bin/redis-server 127.0.0.1:6379

Oct 31 09:30:37 crifan.com systemd[1]: Starting Redis In-Memory Data Store...
Oct 31 09:30:37 crifan.com systemd[1]: PID file /var/run/redis/redis.pid not readable (yet?) after start.
Oct 31 09:30:37 crifan.com systemd[1]: Started Redis In-Memory Data Store.
    重启php-fpm：
    [root@crifan log]# service php-fpm restart
Redirecting to /bin/systemctl restart php-fpm.service
    结果：问题依旧。
    不过再去试了试，突然发现在
    看到页面中提示cookie问题
    点击了 启用cookie
    跳转到WordPress官网页面，没啥帮助
    点击返回之后，突然发现，貌似好了?
    可以跳转到wp-admin
    换Safari浏览器，也可以了：
    -》
    说明此处就是
    redis的cache超过大小了，导致cookie有问题，导致虽然用户名和密码都正确，但是由于生成的cookie，无法被正常保存，导致登录实际上没生效，无法登录，还会跳转回登录页
    而前面之所以问题解决，是因为：
    根据错误提示，点击了 开启cookie
    然后内部redis根据之前设置的：
    maxmemory-policy volatile-lru
    去清理掉之前不用的cookie
    或者说，由于maxmemory已经增加了，有额外空间保存新登录生成的cookie了，就可以了使得登录生效了。
    【总结】
    此处php的log中报错：
    PHP message: RedisException: OOM command not allowed when used memory > 'maxmemory'
    背景：
    此处WordPress开启了redis作为缓存
    原因：此处redis已使用的缓存空间，超过了最大允许值，导致无更多可用内存空间供保存缓存
    解决办法：
    增加缓存空间
    且同时调整缓存策略：确保可以及时删除掉旧的不用的缓存，以便于腾出空间给新内容去缓存
    具体办法：
    编辑配置文件
    /usr/local/redis/etc/redis.conf
    增加最大缓存大小，比如1G：
    maxmemory 1073741824
    另外，也更改缓存失效剔除策略为:
    maxmemory-policy volatile-lru
    即可。
    注：
    （1）更改配置后要重启redis
    service redis-server restart
    也最好顺带重启一下php
    service php-fpm restart
    查看状态是：
    service redis-server status
service php-fpm status
    （2）默认内存策略是
    maxmemory-policy noeviction
    • noeviction
      • eviction：驱赶，剔除
        • no eviction = 不剔除
          • 即使缓存满了也不剔除
            • 导致后续内容无法被redis缓存
              • 导致（登录后的）新cookie无法被保存，导致无法登录
    （3）如何发现是缓存满的了？
    参考别人帖子：
    WordPress排查解决您的站点遇到了致命错误的过程-Redis内存缓存不足 – 全部 – 真不是你的
    去
    redis-cli
info memory
    查看
    redis中的 当前已使用缓存内存空间 和 最大允许缓存内存空间大小
    分别对应的是：
    • used_memory_human
    • maxmemory_human
    自己此处分别都是：451.09M
    对应着配置文件中的
    /usr/local/redis/etc/redis.conf
    maxmemory 473000000
    -》473000000 = 451.08795166015625 MB = 451.09 MB
    由此得知，redis缓存满了

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