Mysql stops and my wordpress stops working

Hello everyone:

I am new to this server, apparently it is a mysql problem that stops when you consume too many resources, someone can help me.

I have a VPS with 500MB Ram digitalocean with Centos 6.5 x64

This is the configuration file of my mysql, the logs can see below. I hope someone can help, of course many thanks.

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
symbolic-links=0
max_connections=70
max_user_connections=30
wait_timeout=10
interactive_timeout=50
long_query_time=5
#log-queries-not-using-indexes
#log-slow-queries=/var/log/mysql/log-slow-queries.log

key_buffer = 16M
myisam_sort_buffer_size = 32M
join_buffer_size=1M
read_buffer_size=1M
sort_buffer_size=2M
table_cache=1024
thread_cache_size=286
interactive_timeout=25
connect_timeout=5
max_allowed_packet=1M
max_connect_errors=1000
query_cache_limit=1M
query_cache_size=8M
query_cache_type=1
tmp_table_size=16M

#innodb_use_native_aio = 0
innodb_file_per_table

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

140912  9:27:44 [Warning] IP address '118.123.119.110' could not be resolved: Name or service not known
140912 12:01:02 mysqld_safe Number of processes running now: 0
140912 12:01:02 mysqld_safe mysqld restarted
140912 12:01:02 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
140912 12:01:02 [Note] Plugin 'FEDERATED' is disabled.
140912 12:01:02 InnoDB: The InnoDB memory heap is disabled
140912 12:01:02 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140912 12:01:02 InnoDB: Compressed tables use zlib 1.2.3
140912 12:01:02 InnoDB: Using Linux native AIO
140912 12:01:02 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
140912 12:01:02 InnoDB: Completed initialization of buffer pool
140912 12:01:02 InnoDB: Fatal error: cannot allocate memory for the buffer pool
140912 12:01:02 [ERROR] Plugin 'InnoDB' init function returned error.
140912 12:01:02 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140912 12:01:02 [ERROR] Unknown/unsupported storage engine: InnoDB
140912 12:01:02 [ERROR] Aborting

140912 12:01:02 [Note] /usr/libexec/mysqld: Shutdown complete

140912 12:01:02 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
140912 16:57:29 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140912 16:57:29 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
140912 16:57:29 [Note] Plugin 'FEDERATED' is disabled.
140912 16:57:29 InnoDB: The InnoDB memory heap is disabled
140912 16:57:29 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140912 16:57:29 InnoDB: Compressed tables use zlib 1.2.3
140912 16:57:29 InnoDB: Using Linux native AIO
140912 16:57:29 InnoDB: Initializing buffer pool, size = 128.0M
140912 16:57:29 InnoDB: Completed initialization of buffer pool
140912 16:57:29 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
140912 16:57:29  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
140912 16:57:30  InnoDB: Waiting for the background threads to start
140912 16:57:31 InnoDB: 5.5.39 started; log sequence number 14584556
140912 16:57:31 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
140912 16:57:31 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
140912 16:57:31 [Note] Server socket created on IP: '0.0.0.0'.
140912 16:57:31 [Note] Event Scheduler: Loaded 0 events
140912 16:57:31 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.39'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL) by Remi