搭建TiDB分布式数据库常见问题
文章目录
- 问题1
- 问题2
- 问题3
- 问题4
问题1
[tikv_servers]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: ssh: Could not resolve hostname tikv_servers: Name or service not known\r\n", "unreachable": true}
[pd_servers]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: ssh: Could not resolve hostname pd_servers: Name or service not known\r\n", "unreachable": true}
解决办法：
修改主机名（永久生效）
修改配置文件/etc/hostname来实现主机名的修改。把该文件内容hostname name中的name替换成自己想要的主机名
重启即可。
$vim /etc/hostname
hostname myname
问题2
[spark_master]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: ssh: Could not resolve hostname spark_master: Name or service not known\r\n", "unreachable": true}
[spark_slaves]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: ssh: Could not resolve hostname spark_slaves: Name or service not known\r\n", "unreachable": true}
[192.168.56.155]: Ansible FAILED! => playbook: bootstrap.yml; TASK: check_system_optional : Preflight check - Check TiDB server's CPU; message: {"changed": false, "msg": "This machine does not have sufficient CPU to run TiDB, at least 8 cores."}
[192.168.56.155]: Ansible FAILED! => playbook: bootstrap.yml; TASK: check_system_optional : Preflight check - Check TiDB server's CPU; message: {"changed": false, "msg": "This machine does not have sufficient CPU to run TiDB, at least 8 cores."}
TASK [check_system_optional : Preflight check - Check TiDB server's CPU] ************************************************************************
fatal: [192.168.56.155]: FAILED! => {"changed": false, "msg": "This machine does not have sufficient CPU to run TiDB, at least 8 cores."}
NO MORE HOSTS LEFT ******************************************************************************************************************************
to retry, use: --limit @/root/tidb-ansible/retry_files/bootstrap.retry
PLAY RECAP **************************************************************************************************************************************
192.168.56.150 : ok=0 changed=0 unreachable=1 failed=0
192.168.56.151 : ok=30 changed=8 unreachable=0 failed=1
192.168.56.152 : ok=30 changed=8 unreachable=0 failed=0
192.168.56.153 : ok=33 changed=10 unreachable=0 failed=0
192.168.56.154 : ok=33 changed=10 unreachable=0 failed=0
192.168.56.155 : ok=33 changed=10 unreachable=0 failed=0
localhost : ok=1 changed=0 unreachable=0 failed=0
ERROR MESSAGE SUMMARY ***************************************************************************************************************************
[192.168.56.155]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).\r\n", "unreachable": true}
[192.168.56.155]: Ansible FAILED! => playbook: bootstrap.yml; TASK: check_system_optional : Preflight check - Check TiDB server's CPU; message: {"changed": false, "msg": "This machine does not have sufficient CPU to run TiDB, at least 8 cores."}
ERROR MESSAGE SUMMARY ***************************************************************************************************************************
[192.168.56.155]: Ansible UNREACHABLE! => playbook: bootstrap.yml; TASK: pre-ansible : disk space check - fail when disk is full; message: {"changed": false, "msg": "Failed to connect to the host via ssh: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).\r\n", "unreachable": true}
解决办法：
修改vim bootstrap.yml文件，并注释掉以下的内容
在目录/home/tidb/tidb-ansible下
- name: check system
hosts: all
any_errors_fatal: true
roles:
- check_system_necessary
#- { role: check_system_optional, when: not dev_mode }
如果是非SSD 测试的话 ，最好将如下的内容注释掉
- name: tikv_servers machine benchmark
hosts: tikv_servers
gather_facts: false
roles:
# - { role: machine_benchmark, when: not dev_mode }
问题3
2018-12-08 17:23:10,210 p=7460 u=tidb | TASK [pre-ansible : Redhat/CentOS - install python] ***************************************************************
2018-12-08 17:23:10,282 p=7460 u=tidb | TASK [pre-ansible : Redhat/CentOS - Make sure ntp, ntpstat have been installed] ***********************************
2018-12-08 17:23:11,596 p=7460 u=tidb | ok: [192.168.56.156] => (item=[u'ntp'])
2018-12-08 17:23:11,616 p=7460 u=tidb | TASK [pre-ansible : Debian/Ubuntu - Make sure ntp, ntpstat have been installed] ***********************************
2018-12-08 17:23:11,838 p=7460 u=tidb | TASK [bootstrap : gather facts] ***********************************************************************************
解决办法：
修改vim inventory.ini文件，将enable_ntpd 设置为False
在目录/home/tidb/tidb-ansible下
enable_ntpd = False
set_hostname = False
注意：tidb中的配置文件第一个字母都是大写
在生产环境，必须安装NTP来保证各个数据库服务器时间一致
具体配置请自行百度
问题4
2018-12-08 18:49:19,574 p=30037 u=tidb | TASK [import grafana dashboards - run import script] **************************************************************
2018-12-08 18:49:20,200 p=30037 u=tidb | fatal: [192.168.56.155 -> localhost]: FAILED! => {"changed": true, "cmd": "./grafana-config-copy.py", "delta": "0:00:00.383906", "end": "2018-12-08 18:49:20.169766", "msg": "non-zero return code", "rc": 126, "start": "2018-12-08 18:49:19.785860", "stderr": "/bin/sh: ./grafana-config-copy.py: 权限不够", "stderr_lines": ["/bin/sh: ./grafana-config-copy.py: 权限不够"], "stdout": "", "stdout_lines": []}
2018-12-08 18:49:20,200 fail [192.168.43.191]: Ansible FAILED! => playbook: start.yml; TASK: import grafana dashboards - run import script; message: {"changed": true, "cmd": "./grafana-config-copy.py", "delta": "0:00:00.383906", "end": "2018-12-08 18:49:20.169766", "msg": "non-zero return code", "rc": 126, "start": "2018-12-08 18:49:19.785860", "stderr": "/bin/sh: ./grafana-config-copy.py: 权限不够", "stderr_lines": ["/bin/sh: ./grafana-config-copy.py: 权>限不够"], "stdout": "", "stdout_lines": []}
2018-12-08 18:49:20,202 p=30037 u=tidb | to retry, use: --limit @/home/tidb/tidb-ansible/retry_files/start.retry
本人多次添加授权等方法都不行。
最后还是修改了 start.yml 文件。
原始的文件是这样
修改后的文件
