目录

创建 Listener

我们知道只有为 loadbalancer 创建 listener 时才会启动 haproxy 服务进程。

从 UML 可知,执行指令 openstack loadbalancer listener create --protocol HTTP --protocol-port 8080 lb-1 创建 Listener 时会执行到 Task:ListenersUpdate,由 ListenersUpdate 完成了 haproxy 配置文件的 Upload 和 haproxy 服务进程的 Reload。

配置文件 /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557/haproxy.cfg,其中 1385d3c4-615e-4a92-aea1-c4fa51a75557 为 Listener UUID:

# Configuration for loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
global
daemon
user nobody
log /dev/log local0
log /dev/log local1 notice
stats socket /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557.sock mode 0666 level user
maxconn 1000000 defaults
log global
retries 3
option redispatch peers 1385d3c4615e4a92aea1c4fa51a75557_peers
peer l_Ustq0qE-h-_Q1dlXLXBAiWR8U 172.16.1.7:1025
peer O08zAgUhIv9TEXhyYZf2iHdxOkA 172.16.1.3:1025 frontend 1385d3c4-615e-4a92-aea1-c4fa51a75557
option httplog
maxconn 1000000
bind 172.16.1.10:8080
mode http
timeout client 50000

因为此时的 Listener 只指定了监听的协议和端口,所以 frontend section 也设置了相应的 bind 172.16.1.10:8080mode http

服务进程:systemctl status haproxy-1385d3c4-615e-4a92-aea1-c4fa51a75557.service 其中 1385d3c4-615e-4a92-aea1-c4fa51a75557 为 Listener UUID:

# file: /usr/lib/systemd/system/haproxy-1385d3c4-615e-4a92-aea1-c4fa51a75557.service

[Unit]
Description=HAProxy Load Balancer
After=network.target syslog.service amphora-netns.service
Before=octavia-keepalived.service
Wants=syslog.service
Requires=amphora-netns.service [Service]
# Force context as we start haproxy under "ip netns exec"
SELinuxContext=system_u:system_r:haproxy_t:s0 Environment="CONFIG=/var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557/haproxy.cfg" "USERCONFIG=/var/lib/octavia/haproxy-default-user-group.conf" "PIDFILE=/var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557/1385d3c4-615e-4a92-aea1-c4fa51a75557.pid" ExecStartPre=/usr/sbin/haproxy -f $CONFIG -f $USERCONFIG -c -q -L O08zAgUhIv9TEXhyYZf2iHdxOkA ExecReload=/usr/sbin/haproxy -c -f $CONFIG -f $USERCONFIG -L O08zAgUhIv9TEXhyYZf2iHdxOkA
ExecReload=/bin/kill -USR2 $MAINPID ExecStart=/sbin/ip netns exec amphora-haproxy /usr/sbin/haproxy-systemd-wrapper -f $CONFIG -f $USERCONFIG -p $PIDFILE -L O08zAgUhIv9TEXhyYZf2iHdxOkA KillMode=mixed
Restart=always
LimitNOFILE=2097152 [Install]
WantedBy=multi-user.target

从服务进程配置可以看出实际启动的服务为 /usr/sbin/haproxy-systemd-wrapper,它是运行在 namespace amphora-haproxy 中的,该脚本做的事情可以从日志了解到:

Nov 15 10:12:01 amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77 ip[13206]: haproxy-systemd-wrapper: executing /usr/sbin/haproxy -f /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557/haproxy.cfg -f /var/lib/octavia/haproxy-default-user-group.conf -p /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557/1385d3c4-615e-4a92-aea1-c4fa51a75557.pid -L O08zAgUhIv9TEXhyYZf2iHdxOkA -Ds

就是调用了 /usr/sbin/haproxy 指令而已。

创建 Pool

我们还是主要关注 octavia-worker 的 create pool flow。

create pool flow 中最重要的还是在于 Task:ListenersUpdate,更新 haproxy 的配置文件。比如:我们执行指令 openstack loadbalancer pool create --protocol HTTP --lb-algorithm ROUND_ROBIN --listener 1385d3c4-615e-4a92-aea1-c4fa51a75557 为 listener 创建一个 default pool。

[root@control01 ~]# openstack loadbalancer listener list
+--------------------------------------+--------------------------------------+------+----------------------------------+----------+---------------+----------------+
| id | default_pool_id | name | project_id | protocol | protocol_port | admin_state_up |
+--------------------------------------+--------------------------------------+------+----------------------------------+----------+---------------+----------------+
| 1385d3c4-615e-4a92-aea1-c4fa51a75557 | 8196f752-a367-4fb4-9194-37c7eab95714 | | 9e4fe13a6d7645269dc69579c027fde4 | HTTP | 8080 | True |
+--------------------------------------+--------------------------------------+------+----------------------------------+----------+---------------+----------------+

haproxy 的配置文件会添加一个 backend section,并且根据上述 CLI 传入的参数设定了 backend mode httpbalance roundrobin

# Configuration for loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
global
daemon
user nobody
log /dev/log local0
log /dev/log local1 notice
stats socket /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557.sock mode 0666 level user
maxconn 1000000 defaults
log global
retries 3
option redispatch peers 1385d3c4615e4a92aea1c4fa51a75557_peers
peer l_Ustq0qE-h-_Q1dlXLXBAiWR8U 172.16.1.7:1025
peer O08zAgUhIv9TEXhyYZf2iHdxOkA 172.16.1.3:1025 frontend 1385d3c4-615e-4a92-aea1-c4fa51a75557
option httplog
maxconn 1000000
bind 172.16.1.10:8080
mode http
default_backend 8196f752-a367-4fb4-9194-37c7eab95714 # UUID of pool
timeout client 50000 backend 8196f752-a367-4fb4-9194-37c7eab95714
mode http
balance roundrobin
fullconn 1000000
option allbackups
timeout connect 5000
timeout server 50000

需要注意的是,创建一个 pool 时可以指定一个 listener uuid 或者 loadbalancer uuid。当指定了前者时,意味着为 listener 指定了一个 default pool,listener 只能有一个 default pool。后续再为该 listener 指定 default pool 则会触发异常;当指定了 loadbalancer uuid 时,则创建了一个 shared pool。shared pool 能被同属一个 loadbalancer 下的所有 listener 共享,常被用于辅助实现 l7policy 的功能。当 Listener 的 l7policy 动作被设定为为「转发至另一个 pool」时,此时就可以选定一个 shared pool。shared pool 可以接受同属 loadbalancer 下所有 listener 的转发请求。

执行指令创建一个 shared pool:

[root@control01 ~]# openstack loadbalancer pool create --protocol HTTP --lb-algorithm ROUND_ROBIN --loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| admin_state_up | True |
| created_at | 2018-11-20T03:35:08 |
| description | |
| healthmonitor_id | |
| id | 822f78c3-ea2c-4770-bef0-e97f1ac2eba8 |
| lb_algorithm | ROUND_ROBIN |
| listeners | |
| loadbalancers | 01197be7-98d5-440d-a846-cd70f52dc503 |
| members | |
| name | |
| operating_status | OFFLINE |
| project_id | 9e4fe13a6d7645269dc69579c027fde4 |
| protocol | HTTP |
| provisioning_status | PENDING_CREATE |
| session_persistence | None |
| updated_at | None |
+---------------------+--------------------------------------+

注意,单纯的创建 shared pool 不将其绑定到 listener 的话,listener 对应的 haproxy 配置文件的内容是不会被更改的。

创建 Member

使用下述指令创建一个 member 到 default pool,选项指定了云主机所在的 subnet、ipaddress 以及接收数据转发的 protocol-port。

[root@control01 ~]# openstack loadbalancer member create --subnet-id 2137f3fb-00ee-41a9-b66e-06705c724a36 --address 192.168.1.14 --protocol-port 80 8196f752-a367-4fb4-9194-37c7eab95714
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| address | 192.168.1.14 |
| admin_state_up | True |
| created_at | 2018-11-20T06:09:58 |
| id | b6e464fd-dd1e-4775-90f2-4231444a0bbe |
| name | |
| operating_status | NO_MONITOR |
| project_id | 9e4fe13a6d7645269dc69579c027fde4 |
| protocol_port | 80 |
| provisioning_status | PENDING_CREATE |
| subnet_id | 2137f3fb-00ee-41a9-b66e-06705c724a36 |
| updated_at | None |
| weight | 1 |
| monitor_port | None |
| monitor_address | None |
| backup | False |
+---------------------+--------------------------------------+

在 octavia-api 层面首先会通过配置 CONF.networking.reserved_ips 验证该 menber 的 ipaddress 是否可用,验证 member 所在的 subnet 是否存在,然后再进入 octavia-worker 的流程。

CalculateDelta

CalculateDelta 轮询 loadbalancer 下属的 amphorae 执行 Task:CalculateAmphoraDelta,用于计算 Amphora 上的 NICs 数量与需要的 NICs 之间的 “差值”。

# file: /opt/rocky/octavia/octavia/controller/worker/tasks/network_tasks.py

class CalculateAmphoraDelta(BaseNetworkTask):

    default_provides = constants.DELTA

    def execute(self, loadbalancer, amphora):
LOG.debug("Calculating network delta for amphora id: %s", amphora.id) # Figure out what networks we want
# seed with lb network(s)
vrrp_port = self.network_driver.get_port(amphora.vrrp_port_id)
desired_network_ids = {vrrp_port.network_id}.union(
CONF.controller_worker.amp_boot_network_list) for pool in loadbalancer.pools:
member_networks = [
self.network_driver.get_subnet(member.subnet_id).network_id
for member in pool.members
if member.subnet_id
]
desired_network_ids.update(member_networks) nics = self.network_driver.get_plugged_networks(amphora.compute_id)
# assume we don't have two nics in the same network
actual_network_nics = dict((nic.network_id, nic) for nic in nics) del_ids = set(actual_network_nics) - desired_network_ids
delete_nics = list(
actual_network_nics[net_id] for net_id in del_ids) add_ids = desired_network_ids - set(actual_network_nics)
add_nics = list(n_data_models.Interface(
network_id=net_id) for net_id in add_ids)
delta = n_data_models.Delta(
amphora_id=amphora.id, compute_id=amphora.compute_id,
add_nics=add_nics, delete_nics=delete_nics)
return delta

简单来说,首先获取所需要的 networks:desired_network_ids 和已经存在的 networks:actual_network_nics。然后计算出待删除的 networks:delete_nics 和待添加的 networks:add_nics,并最终 returns 一个 Delta data models 到 Task:HandleNetworkDeltas 执行实际的 Amphora NICs 添加与删除。

HandleNetworkDeltas

Task:HandleNetworkDelta —— Plug or unplug networks based on delta。

# file: /opt/rocky/octavia/octavia/controller/worker/tasks/network_tasks.py

class HandleNetworkDelta(BaseNetworkTask):
"""Task to plug and unplug networks Plug or unplug networks based on delta
""" def execute(self, amphora, delta):
"""Handle network plugging based off deltas."""
added_ports = {}
added_ports[amphora.id] = []
for nic in delta.add_nics:
interface = self.network_driver.plug_network(delta.compute_id,
nic.network_id)
port = self.network_driver.get_port(interface.port_id)
port.network = self.network_driver.get_network(port.network_id)
for fixed_ip in port.fixed_ips:
fixed_ip.subnet = self.network_driver.get_subnet(
fixed_ip.subnet_id)
added_ports[amphora.id].append(port)
for nic in delta.delete_nics:
try:
self.network_driver.unplug_network(delta.compute_id,
nic.network_id)
except base.NetworkNotFound:
LOG.debug("Network %d not found ", nic.network_id)
except Exception:
LOG.exception("Unable to unplug network")
return added_ports

根据 Task:CalculateAmphoraDelta returns 的 Delta data models 来进行 amphorae interfaces 的挂载和卸载。

# file: /opt/rocky/octavia/octavia/network/drivers/neutron/allowed_address_pairs.py

    def plug_network(self, compute_id, network_id, ip_address=None):
try:
interface = self.nova_client.servers.interface_attach(
server=compute_id, net_id=network_id, fixed_ip=ip_address,
port_id=None)
except nova_client_exceptions.NotFound as e:
if 'Instance' in str(e):
raise base.AmphoraNotFound(str(e))
elif 'Network' in str(e):
raise base.NetworkNotFound(str(e))
else:
raise base.PlugNetworkException(str(e))
except Exception:
message = _('Error plugging amphora (compute_id: {compute_id}) '
'into network {network_id}.').format(
compute_id=compute_id,
network_id=network_id)
LOG.exception(message)
raise base.PlugNetworkException(message) return self._nova_interface_to_octavia_interface(compute_id, interface) def unplug_network(self, compute_id, network_id, ip_address=None):
interfaces = self.get_plugged_networks(compute_id)
if not interfaces:
msg = ('Amphora with compute id {compute_id} does not have any '
'plugged networks').format(compute_id=compute_id)
raise base.NetworkNotFound(msg) unpluggers = self._get_interfaces_to_unplug(interfaces, network_id,
ip_address=ip_address)
for index, unplugger in enumerate(unpluggers):
try:
self.nova_client.servers.interface_detach(
server=compute_id, port_id=unplugger.port_id)
except Exception:
LOG.warning('Error unplugging port {port_id} from amphora '
'with compute ID {compute_id}. '
'Skipping.'.format(port_id=unplugger.port_id,
compute_id=compute_id))

最后会将 added_port return 到后续的 TASK:AmphoraePostNetworkPlug 使用。

AmphoraePostNetworkPlug

Task:AmphoraePostNetworkPlug 的主要工作是将通过 novaclient 挂载到 amphora 上的 interface 注入到 namespace 中。

回顾一下 Amphora 的网络拓扑:

  • Amphora 初始状态下只有一个用于与 lb-mgmt-net 通信的端口:
root@amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77:~# ifconfig
ens3 Link encap:Ethernet HWaddr fa:16:3e:b6:8f:a5
inet addr:192.168.0.9 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:feb6:8fa5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:19462 errors:14099 dropped:0 overruns:0 frame:14099
TX packets:70317 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1350041 (1.3 MB) TX bytes:15533572 (15.5 MB) lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

如上,inet addr:192.168.0.9 是有 lb-mgmt-net DHCP 分配的。

  • 在 Amphora 被分配到 loadbalancer 之后会添加一个 vrrp_port 类型的端口,vrrp_port 充当着 Keepalived 虚拟路由的一张网卡,被注入到 namespace 中,一般是 eth1。
root@amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77:~# ip netns exec amphora-haproxy ifconfig
eth1 Link encap:Ethernet HWaddr fa:16:3e:f4:69:4b
inet addr:172.16.1.3 Bcast:172.16.1.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fef4:694b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:12705 errors:0 dropped:0 overruns:0 frame:0
TX packets:613211 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:762300 (762.3 KB) TX bytes:36792968 (36.7 MB) eth1:0 Link encap:Ethernet HWaddr fa:16:3e:f4:69:4b
inet addr:172.16.1.10 Bcast:172.16.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1

VRRP IP: 172.16.1.3 和 VIP: 172.16.1.10 均由 lb-vip-network 的 DHCP 分配,分别对应 lb-vip-network 上的 ports octavia-lb-vrrp-<amphora_uuid> 与 octavia-lb-<loadbalancer_uuid>。interface eth1 的配置为:

root@amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77:~# ip netns exec amphora-haproxy cat /etc/network/interfaces.d/eth1
auto eth1
iface eth1 inet dhcp
root@amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77:~# ip netns exec amphora-haproxy cat /etc/network/interfaces.d/eth1.cfg # Generated by Octavia agent
auto eth1 eth1:0
iface eth1 inet static
address 172.16.1.3
broadcast 172.16.1.255
netmask 255.255.255.0
gateway 172.16.1.1
mtu 1450 iface eth1:0 inet static
address 172.16.1.10
broadcast 172.16.1.255
netmask 255.255.255.0
# Add a source routing table to allow members to access the VIP
post-up /sbin/ip route add 172.16.1.0/24 dev eth1 src 172.16.1.10 scope link table 1
post-up /sbin/ip route add default via 172.16.1.1 dev eth1 onlink table 1
post-down /sbin/ip route del default via 172.16.1.1 dev eth1 onlink table 1
post-down /sbin/ip route del 172.16.1.0/24 dev eth1 src 172.16.1.10 scope link table 1
post-up /sbin/ip rule add from 172.16.1.10/32 table 1 priority 100
post-down /sbin/ip rule del from 172.16.1.10/32 table 1 priority 100
post-up /sbin/iptables -t nat -A POSTROUTING -p udp -o eth1 -j MASQUERADE
post-down /sbin/iptables -t nat -D POSTROUTING -p udp -o eth1 -j MASQUERADE

Task:AmphoraePostNetworkPlug 主要就是为了生成这些配置文件的内容。

  • 在为 loadbalancer 创建了 member 之后,会根据 menber 所在的 subnet 再为 amphora 添加新的 interfaces。当然了,如果说 member 与 vrrp_port 来自同一个 subnet,则不再为 amphora 添加新的 inferface 了。
root@amphora-cd444019-ce8f-4f89-be6b-0edf76f41b77:~# ip netns exec amphora-haproxy ifconfig
eth1 Link encap:Ethernet HWaddr fa:16:3e:f4:69:4b
inet addr:172.16.1.3 Bcast:172.16.1.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fef4:694b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:12705 errors:0 dropped:0 overruns:0 frame:0
TX packets:613211 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:762300 (762.3 KB) TX bytes:36792968 (36.7 MB) eth1:0 Link encap:Ethernet HWaddr fa:16:3e:f4:69:4b
inet addr:172.16.1.10 Bcast:172.16.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1 eth2 Link encap:Ethernet HWaddr fa:16:3e:18:23:7a
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe18:237a/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1
RX packets:8 errors:2 dropped:0 overruns:0 frame:2
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2156 (2.1 KB) TX bytes:808 (808.0 B)

inet addr:192.168.1.3 由 member 所在的 subnet DHCP 分配,配置文件如下:

# Generated by Octavia agent
auto eth2
iface eth2 inet static
address 192.168.1.3
broadcast 192.168.1.255
netmask 255.255.255.0
mtu 1450
post-up /sbin/iptables -t nat -A POSTROUTING -p udp -o eth2 -j MASQUERADE
post-down /sbin/iptables -t nat -D POSTROUTING -p udp -o eth2 -j MASQUERADE

ListenersUpdate

显然,最后 haproxy 配置的更改还是由 Task:ListenersUpdate 完成。

# Configuration for loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
global
daemon
user nobody
log /dev/log local0
log /dev/log local1 notice
stats socket /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557.sock mode 0666 level user
maxconn 1000000 defaults
log global
retries 3
option redispatch peers 1385d3c4615e4a92aea1c4fa51a75557_peers
peer l_Ustq0qE-h-_Q1dlXLXBAiWR8U 172.16.1.7:1025
peer O08zAgUhIv9TEXhyYZf2iHdxOkA 172.16.1.3:1025 frontend 1385d3c4-615e-4a92-aea1-c4fa51a75557
option httplog
maxconn 1000000
bind 172.16.1.10:8080
mode http
default_backend 8196f752-a367-4fb4-9194-37c7eab95714
timeout client 50000 backend 8196f752-a367-4fb4-9194-37c7eab95714
mode http
balance roundrobin
fullconn 1000000
option allbackups
timeout connect 5000
timeout server 50000
server b6e464fd-dd1e-4775-90f2-4231444a0bbe 192.168.1.14:80 weight 1

实际上,添加 member 就是在 backend(default pool)中加入了 server <member_id> 192.168.1.14:80 weight 1 项目,表示该云主机作为了 default pool 的一部分。

创建 L7policy & L7rule & Health Monitor

L7policy 对象在 Octavia 中的语义是用于描述转发的动作类型(e.g. 转发至 pool?转发至 URL?拒绝转发?)以及 L7rule 的容器,下属于 Listener。

L7Rule 对象在 Octavia 中的语义是数据转发的匹配域,描述了转发的路由关系,下属于 L7policy。

Health Monitor 对象用于对 Pool 中 Member 的健康状态进行监控,本质就是一条数据库记录,描述了健康检查的的规则,下属于 Pool。

从上述三个 UML 图可以感受到,Create L7policy、L7rule、Health-Monitor 和 Pool 实际上非常类似,关键都是在于 TASK:ListenersUpdate 对 haproxy 配置文件内容的更新。所以,我们主要通过一些例子来观察 haproxy 配置文件的更改规律即可。

  • EXAMPLE 1
# 创建 pool 8196f752-a367-4fb4-9194-37c7eab95714 的 healthmonitor
[root@control01 ~]# openstack loadbalancer healthmonitor create --name healthmonitor1 --type PING --delay 5 --timeout 10 --max-retries 3 8196f752-a367-4fb4-9194-37c7eab95714 # pool 8196f752-a367-4fb4-9194-37c7eab95714 下属有一个 member
[root@control01 ~]# openstack loadbalancer member list 8196f752-a367-4fb4-9194-37c7eab95714
+--------------------------------------+------+----------------------------------+---------------------+--------------+---------------+------------------+--------+
| id | name | project_id | provisioning_status | address | protocol_port | operating_status | weight |
+--------------------------------------+------+----------------------------------+---------------------+--------------+---------------+------------------+--------+
| b6e464fd-dd1e-4775-90f2-4231444a0bbe | | 9e4fe13a6d7645269dc69579c027fde4 | ACTIVE | 192.168.1.14 | 80 | ONLINE | 1 |
+--------------------------------------+------+----------------------------------+---------------------+--------------+---------------+------------------+--------+ # listener 的 1385d3c4-615e-4a92-aea1-c4fa51a75557 l7policy 就是转发至 default pool
[root@control01 ~]# openstack loadbalancer l7policy create --name l7p1 --action REDIRECT_TO_POOL --redirect-pool 8196f752-a367-4fb4-9194-37c7eab95714 1385d3c4-615e-4a92-aea1-c4fa51a75557 # 转发的匹配与就是 hostname 以 server 开头的 instances
[root@control01 ~]# openstack loadbalancer l7rule create --type HOST_NAME --compare-type STARTS_WITH --value "server" 87593985-e02f-4880-b80f-22a4095c05a7

haproxy 配置文件:

# Configuration for loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
global
daemon
user nobody
log /dev/log local0
log /dev/log local1 notice
stats socket /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557.sock mode 0666 level user
maxconn 1000000
external-check defaults
log global
retries 3
option redispatch peers 1385d3c4615e4a92aea1c4fa51a75557_peers
peer l_Ustq0qE-h-_Q1dlXLXBAiWR8U 172.16.1.7:1025
peer O08zAgUhIv9TEXhyYZf2iHdxOkA 172.16.1.3:1025 frontend 1385d3c4-615e-4a92-aea1-c4fa51a75557
option httplog
maxconn 1000000
# 前端监听 http://172.16.1.10:8080
bind 172.16.1.10:8080
mode http
# ACL 转发规则
acl 8d9b8b1e-83d7-44ca-a5b4-0103d5f90cb9 req.hdr(host) -i -m beg server
# if ACL 8d9b8b1e-83d7-44ca-a5b4-0103d5f90cb9 满足,则转发至 backend 8196f752-a367-4fb4-9194-37c7eab95714
use_backend 8196f752-a367-4fb4-9194-37c7eab95714 if 8d9b8b1e-83d7-44ca-a5b4-0103d5f90cb9
# 如果没有匹配到任何 ACL 规则,则转发至默认 backend 8196f752-a367-4fb4-9194-37c7eab95714
default_backend 8196f752-a367-4fb4-9194-37c7eab95714
timeout client 50000 backend 8196f752-a367-4fb4-9194-37c7eab95714
# 后端监听协议为 http
mode http
# 负载均衡算法为 RR 轮询
balance roundrobin
timeout check 10s
option external-check
# 使用脚本 ping-wrapper.sh 对 server 进行健康检查
external-check command /var/lib/octavia/ping-wrapper.sh
fullconn 1000000
option allbackups
timeout connect 5000
timeout server 50000
# 后端真实服务器(real server),服务端口为 80,监控检查规则为 inter 5s fall 3 rise 3
server b6e464fd-dd1e-4775-90f2-4231444a0bbe 192.168.1.14:80 weight 1 check inter 5s fall 3 rise 3

健康检查脚本:

#!/bin/bash
if [[ $HAPROXY_SERVER_ADDR =~ ":" ]]; then
/bin/ping6 -q -n -w 1 -c 1 $HAPROXY_SERVER_ADDR > /dev/null 2>&1
else
/bin/ping -q -n -w 1 -c 1 $HAPROXY_SERVER_ADDR > /dev/null 2>&1
fi

脚本的内容,正如我们设定的监控方式为 PING。

  • EXAMPLE 2
[root@control01 ~]# openstack loadbalancer healthmonitor create --name healthmonitor1 --type PING --delay 5 --timeout 10 --max-retries 3 822f78c3-ea2c-4770-bef0-e97f1ac2eba8

[root@control01 ~]# openstack loadbalancer l7policy create --name l7p1 --action REDIRECT_TO_POOL --redirect-pool 822f78c3-ea2c-4770-bef0-e97f1ac2eba8 1385d3c4-615e-4a92-aea1-c4fa51a75557

[root@control01 ~]# openstack loadbalancer l7rule create --type HOST_NAME --compare-type STARTS_WITH --value "server" fb90a3b5-c97c-4d99-973e-118840a7a236

haproxy 的配置文件内容变更为:

# Configuration for loadbalancer 01197be7-98d5-440d-a846-cd70f52dc503
global
daemon
user nobody
log /dev/log local0
log /dev/log local1 notice
stats socket /var/lib/octavia/1385d3c4-615e-4a92-aea1-c4fa51a75557.sock mode 0666 level user
maxconn 1000000
external-check defaults
log global
retries 3
option redispatch peers 1385d3c4615e4a92aea1c4fa51a75557_peers
peer l_Ustq0qE-h-_Q1dlXLXBAiWR8U 172.16.1.7:1025
peer O08zAgUhIv9TEXhyYZf2iHdxOkA 172.16.1.3:1025 frontend 1385d3c4-615e-4a92-aea1-c4fa51a75557
option httplog
maxconn 1000000
bind 172.16.1.10:8080
mode http
acl 8d9b8b1e-83d7-44ca-a5b4-0103d5f90cb9 req.hdr(host) -i -m beg server
use_backend 8196f752-a367-4fb4-9194-37c7eab95714 if 8d9b8b1e-83d7-44ca-a5b4-0103d5f90cb9
acl c76f36bc-92c0-4f48-8d57-a13e3b1f09e1 req.hdr(host) -i -m beg server
use_backend 822f78c3-ea2c-4770-bef0-e97f1ac2eba8 if c76f36bc-92c0-4f48-8d57-a13e3b1f09e1
default_backend 8196f752-a367-4fb4-9194-37c7eab95714
timeout client 50000 backend 8196f752-a367-4fb4-9194-37c7eab95714
mode http
balance roundrobin
timeout check 10s
option external-check
external-check command /var/lib/octavia/ping-wrapper.sh
fullconn 1000000
option allbackups
timeout connect 5000
timeout server 50000
server b6e464fd-dd1e-4775-90f2-4231444a0bbe 192.168.1.14:80 weight 1 check inter 5s fall 3 rise 3 backend 822f78c3-ea2c-4770-bef0-e97f1ac2eba8
mode http
balance roundrobin
timeout check 10s
option external-check
external-check command /var/lib/octavia/ping-wrapper.sh
fullconn 1000000
option allbackups
timeout connect 5000
timeout server 50000
server 7da6f176-36c6-479a-9d86-c892ecca6ae5 192.168.1.6:80 weight 1 check inter 5s fall 3 rise 3

可见,在为 listener 添加了 shared pool 之后,会在增加一个 backend section 对应 shared pool 822f78c3-ea2c-4770-bef0-e97f1ac2eba8。

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