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调度器通过 kubernetes 的监测（Watch）机制来发现集群中新创建且尚未被调度到 Node 上的 Pod。调度器会将发现的每一个未调度的 Pod 调度到一个合适的 Node 上来运行。调度器会依据下文的调度原则来做出调度选择。

具体说明请参考官网
Kubernetes 调度器

接下来我们来部署 kube-scheduler
主机名 角色 ip
hdss7-21.host.com kube-scheduler 10.4.7.21
hdss7-22.host.com kube-scheduler 10.4.7.22

调度器的启动脚本相对简单

[root@hdss7-21 bin]# vim /usr/local/kubernetes/server/bin/kube-scheduler.sh
#!/bin/sh
./kube-scheduler \
  --leader-elect  \
  --log-dir /data/logs/kubernetes/kube-scheduler \
  --master http://127.0.0.1:8080 \
  --v 2


[root@hdss7-22 bin]# vim /usr/local/kubernetes/server/bin/kube-scheduler.sh
#!/bin/sh
./kube-scheduler \
  --leader-elect  \
  --log-dir /data/logs/kubernetes/kube-scheduler \
  --master http://127.0.0.1:8080 \
  --v 2


[root@hdss7-21 ~]# chmod +x /usr/local/kubernetes/server/bin/kube-scheduler.sh
[root@hdss7-21 ~]# mkdir -p /data/logs/kubernetes/kube-schedule


[root@hdss7-22 bin]# chmod +x /usr/local/kubernetes/server/bin/kube-scheduler.sh
[root@hdss7-22 bin]# mkdir -p /data/logs/kubernetes/kube-scheduler

supervisord 的启动配置文件

[root@hdss7-21 ~]# vim /etc/supervisord.d/kube-scheduler.ini
[program:kube-scheduler-7-21]
command=/usr/local/kubernetes/server/bin/kube-scheduler.sh               ; the program (relative uses PATH, can take args)
numprocs=1                                                               ; number of processes copies to start (def 1)
directory=/usr/local/kubernetes/server/bin                               ; directory to cwd to before exec (def no cwd)
autostart=true                                                           ; start at supervisord start (default: true)
autorestart=true                                                         ; retstart at unexpected quit (default: true)
startsecs=30                                                             ; number of secs prog must stay running (def. 1)
startretries=3                                                           ; max # of serial start failures (default 3)
exitcodes=0,2                                                            ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                          ; signal used to kill process (default TERM)
stopwaitsecs=10                                                          ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                                ; setuid to this UNIX account to run the program
redirect_stderr=true                                                     ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-scheduler/scheduler.stdout.log ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                             ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                                 ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                              ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                              ; emit events on stdout writes (default false)

root@hdss7-22 同样的配置这里改为 22
[program:kube-scheduler-7-21]

设置软链并查看几个组件的状态注意需要在有签发证书的机器执行

[root@hdss7-21 kubernetes]# ln -sf /usr/local/kubernetes/server/bin/kubectl /usr/sbin/kubectl
[root@hdss7-21 kubernetes]# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler             Healthy   ok                   
controller-manager       Healthy   ok                   
etcd-0               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}   
etcd-1               Healthy   {"health": "true"}