First, the environment and precautions
jdk: (build 1.8.0_151-b12)
elasticsearch：6.6.1
CentOS 7
Attention to the problem: jdk version 1.8 must not be too low
root user can not start es, must create a new user
Download extract
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.6.1.zip unzip elasticsearch-6.6.1.zip
1.1 Create a new user
If you start with a root, there will be "java.lang.RuntimeException: can not runelasticsearch as root" error, as shown below:
We need to create a new user to run es
1.1.1. Create a new user
adduser [用户名]
1.1.2. Modify the new user's password
passwd [用户名]
1.1.3. Authorization sudo
The newly created user does not use the sudo command, you need to add to his authorization.
- Add sudoers file writable
chmod -v u+w /etc/sudoers
- Modify sudoers file
vim /etc/sudoers
- Found in the following location sudoers file and add the following
[username] ALL = (ALL) ALL (do not lose the password For new users to use sudo, the last read ALL NOPASSWD: ALL you can)
- Recover sudoers file writable
chmod -v u-w /etc/sudoers
1.1.4. Elasticsearch folder permissions assigned to new users
Change the folder and all subfolders (folder) belongs users and user groups
chown -R kebi:kebi elasticsearch-6.6.1
二、常见问题
2.1JVM virtual machine out of memory
Error: "JavaHotSpot (TM) 64-Bit Server VM warning: INFO: error = 'Cannotallocate memory' (errno = 12)" indicates insufficient memory, configured to jvm.options the config file directory defaults to 2g, can be modified to 1g.
2.2 max_map_count too small
Error "max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]", max_map_count file contains a number of restrictions process can have VMA (virtual memory area), the system default is 65530, modified to 655360.
# In / etc / the sysctl.conf file add the line vm.max_map_count = 655360 # and execute the command sysctl -p
2.3 max file descriptors过小
Error "max file descriptors [65535] for elasticsearchprocess is too low, increase to at least [65536]", maxfile descriptors for the maximum file descriptor, is set to greater than 65536.
- The solution is to modify the file /etc/security/limits.conf
After modify to the next source / etc / profile
ulimit -Hn
ulimit -Sn
2.3.2 max number of threads [3818] for user [es] is too low, increase to at least [4096]
The problem above, the maximum number of threads is too low. Modify the configuration file /etc/security/limits.conf, increase the allocation
* soft nproc 4096 * hard nproc 4096
View command
Ulimit - Hu
Ulimit -su
Then exit the user to log in, otherwise invalid
2.4 Starting error
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
Modify the parameters jvm.options inside the config directory, some packages start when enabled by default -XX: + AssumeMP lead
2.5 external network access settings
Elasticsearch.yml modify files in the config directory
- To modify network.host
0.0.0.0 - To modify discovery.zen.ping.unicast.hosts
["0.0.0.0"]
Rom 2.6 elasticsearch-head plug
Under modify config directory elasticsearch.yml file, add the following in the last two parameters
http.cors.enabled: true http.cors.allow-origin: "*"
2.7 elasticsearch线程队列不够
修改config目录下elasticsearch.yml文件，在最后新增以下参数
thread_pool.bulk.queue_size: 1000
三、启动
3.1 切换新用户
su kebi
3.2 后台运行
进入目录下
bin/elasticsearch -d