#cluster check ./deploy.yaml --user tidb
os-version Fail Ubuntu 16.04 LTS 16.04 not supported, use version 18.04 or higher (ubuntu support is not fully tested, be careful)
cpu-cores Pass number of CPU cores / threads: 24
memory Pass memory size is 131072MB
network Pass network speed of eth0 is 10000MB
network Pass network speed of eth1 is 10000MB
disk Fail mount point / does not have ‘nodelalloc’ option set
disk Warn mount point / does not have ‘noatime’ option set
disk Fail mount point / does not have ‘nodelalloc’ option set
disk Warn mount point / does not have ‘noatime’ option set
limits Fail soft limit of ‘nofile’ for user ‘tidb’ is not set or too low
limits Fail hard limit of ‘nofile’ for user ‘tidb’ is not set or too low
limits Fail soft limit of ‘stack’ for user ‘tidb’ is not set or too low
sysctl Fail net.core.somaxconn = 1024, should be greater than 32768
sysctl Fail net.ipv4.tcp_syncookies = 1, should be 0
sysctl Fail vm.swappiness = 10, should be 0
selinux Pass SELinux is disabled
thp Fail THP is enabled, please disable it for best performance
service Fail service irqbalance not found, should be installed and started
service Pass service firewalld not found, ignore
command Pass numactl: policy: default
有几个疑问：
1）Ubuntu 16.04 LTS 16.04 not supported 是怎么回事？ 不支持吗 还是说某些tidb版本不支持16.04？
2）如果用–apply修复的话，会不会重新mount挂载点，这样会有很大的风险
3）所有的Fail状态的 指定了–apply都会修复吗？
