2018-08-18 09:28:23 +08:00
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# chrony 时间同步
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在安装k8s集群前需确保各节点时间同步；`chrony` 是一个优秀的 `NTP` 实现，性能比ntp好，且配置管理方便；它既可作时间服务器服务端，也可作客户端。
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- `OpenStack` 社区也推荐使用 `chrony`实现各节点之间的时间同步
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## 安装配置介绍
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项目中选定一个节点(`deploy` )作为集群内部其他节点的时间同步源，而 deploy节点本身从公网源同步；当然如果整个集群都无法访问公网，那么请手动校准deploy 节点的时间后，仍旧可以作为内部集群的时间源服务器。
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- 配置 chrony server, 在`/etc/chrony.conf` 配置以下几项，其他项默认值即可
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``` bash
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# 1. 配置时间源，国内可以增加阿里的时间源 ntp1.aliyun.com
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server {{ ntp_server }} iburst
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# 2. 配置允许同步的客户端网段
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allow {{ local_network }}
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# 3. 配置离线也能作为源服务器
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local stratum 10
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```
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- 配置 chrony client
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``` bash
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# 1. 清除所有其他时间源，只配置一个本地 deploy节点作为源
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server {{ groups.deploy[0] }} iburst
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# 2. 其他所有项可以默认配置
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```
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## `kubeasz` 集成安装
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- 修改 ansible hosts 文件，在 `deploy` 节点配置 `NTP_ENABLED=yes` (默认: no)
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2018-10-12 13:30:19 +08:00
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- [可选] 修改 roles/chrony/var/main.yml 中的变量定义，关于文件 roles/chrony/var/main.yml 的由来请看[这里](../setup/config_guide.md)
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2018-08-18 09:28:23 +08:00
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对于新集群或者新节点，`chrony` 的安装配置已经集成到 `90.setup.yml` `01.prepare.yml` `20.addnode.yml` `21.addmaster.yml` 等脚本中；对于已运行中的集群请执行如下命令进行安装：
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`ansible-playbook /etc/ansible/roles/chrony/chrony.yml `
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2019-01-26 12:22:31 +08:00
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## 验证配置
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- 在 chrony server (deploy 节点)检查时间源信息，默认配置为`ntp1.aliyun.com`的地址：
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```
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$ chronyc sources -v
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210 Number of sources = 5
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.-- Source mode '^' = server, '=' = peer, '#' = local clock.
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/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
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| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
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|| .- xxxx [ yyyy ] +/- zzzz
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|| Reachability register (octal) -. | xxxx = adjusted offset,
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|| Log2(Polling interval) --. | | yyyy = measured offset,
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|| \ | | zzzz = estimated error.
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|| | | \
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MS Name/IP address Stratum Poll Reach LastRx Last sample
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===============================================================================
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^* 120.25.115.20 2 9 377 55 +147us[ +250us] +/- 15ms
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^- 85.199.214.100 1 10 377 182 -25ms[ -24ms] +/- 128ms
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^- makaki.miuku.net 2 10 367 307 +61ms[ +61ms] +/- 127ms
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^- static-5-103-139-163.ip.f 1 9 167 572 +532us[ +336us] +/- 117ms
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^- 119.28.183.184 2 7 377 33 -130us[ -130us] +/- 47ms
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```
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- 在 chrony server (deploy 节点)检查时间源同步状态
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```
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chronyc sourcestats -v
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210 Number of sources = 5
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.- Number of sample points in measurement set.
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/ .- Number of residual runs with same sign.
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| / .- Length of measurement set (time).
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| | / .- Est. clock freq error (ppm).
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| | | / .- Est. error in freq.
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| | | | / .- Est. offset.
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| | | | | | On the -.
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| | | | | | samples. \
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Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
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==============================================================================
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120.25.115.20 15 11 44m +0.011 0.909 +4097ns 758us
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85.199.214.100 22 13 49m -3.588 5.097 -23ms 5709us
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makaki.miuku.net 22 14 46m +2.455 6.225 +64ms 4945us
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static-5-103-139-163.ip.f 20 13 42m -2.472 10.168 +3615us 6732us
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119.28.183.184 16 9 19m +10.378 25.190 +3469us 6803us
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```
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- 在 chrony client 检查，可以看到时间源只有一个（deploy 节点地址）
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```
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$ chronyc sources
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210 Number of sources = 1
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MS Name/IP address Stratum Poll Reach LastRx Last sample
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===============================================================================
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^* 192.168.1.1 3 6 377 15 +4085ns[ -25us] +/- 15ms
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$ chronyc sourcestats
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210 Number of sources = 1
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Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
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==============================================================================
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192.168.1.1 5 4 323 -0.252 0.819 -3031ns 15us
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```
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## 验证时间同步状态完成
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chrony 服务启动后，chrony server 会与配置的公网参考时间服务器进行同步；server 同步完成后，chrony client 会与 server 进行时间同步；一般来说整个集群达到时间同步需要几十分钟。可以用如下命令检查，初始时 **NTP synchronized: no**，同步完成后 **NTP synchronized: yes**
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``` bash
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$ ansible all -m shell -a 'timedatectl'
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192.168.1.1 | SUCCESS | rc=0 >>
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Local time: Sat 2019-01-26 11:51:51 HKT
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Universal time: Sat 2019-01-26 03:51:51 UTC
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RTC time: Sat 2019-01-26 03:51:52
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Time zone: Asia/Hong_Kong (HKT, +0800)
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Network time on: yes
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NTP synchronized: yes
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RTC in local TZ: no
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192.168.1.4 | SUCCESS | rc=0 >>
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Local time: Sat 2019-01-26 11:51:51 HKT
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Universal time: Sat 2019-01-26 03:51:51 UTC
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RTC time: Sat 2019-01-26 03:51:52
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Time zone: Asia/Hong_Kong (HKT, +0800)
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Network time on: yes
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NTP synchronized: yes
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RTC in local TZ: no
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192.168.1.2 | SUCCESS | rc=0 >>
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Local time: Sat 2019-01-26 11:51:51 HKT
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Universal time: Sat 2019-01-26 03:51:51 UTC
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RTC time: Sat 2019-01-26 03:51:52
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Time zone: Asia/Hong_Kong (HKT, +0800)
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Network time on: yes
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NTP synchronized: yes
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RTC in local TZ: no
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192.168.1.3 | SUCCESS | rc=0 >>
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Local time: Sat 2019-01-26 11:51:51 HKT
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Universal time: Sat 2019-01-26 03:51:51 UTC
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RTC time: Sat 2019-01-26 03:51:52
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Time zone: Asia/Hong_Kong (HKT, +0800)
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Network time on: yes
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NTP synchronized: yes
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RTC in local TZ: no
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```
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