9e16a7a452
* Re-add 127.0.0.1/8 when bringing down the interfaces With #5353, 127.0.0.1/16 was added to the lo interface, and then 127.0.0.1/8 was removed. However, when bringing down the lo interface, like during a config reload, 127.0.0.1/16 gets removed, but 127.0.0.1/8 isn't added back to the interface. This means that there's a period of time where 127.0.0.1 is not available at all, and services that need to connect to 127.0.01 (such as for redis DB) will fail. To fix this, when going down, add 127.0.0.1/8. Add this address before the existing configuration gets removed, so that 127.0.0.1 is available at all times. Note that running `ifdown lo` doesn't actually bring down the loopback interface; the interface always stays "physically" up. Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
111 lines
4.1 KiB
Django/Jinja
111 lines
4.1 KiB
Django/Jinja
#
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{% block banner %}
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# =============== Managed by SONiC Config Engine DO NOT EDIT! ===============
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# generated from /usr/share/sonic/templates/interfaces.j2 using sonic-cfggen
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# file: /etc/network/interfaces
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#
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{% endblock banner %}
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{% block mgmt_vrf %}
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{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
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auto mgmt
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iface mgmt
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vrf-table 5000
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# The loopback network interface for mgmt VRF that is required for applications like NTP
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up ip link add lo-m type dummy
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up ip link set dev lo-m master mgmt
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up ip addr add 127.0.0.1/16 dev lo-m
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up ip link set lo-m up
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down ip link delete dev lo-m
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{% endif %}
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{% endblock mgmt_vrf %}
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{% block loopback %}
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# The loopback network interface
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auto lo
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iface lo inet loopback
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address 127.0.0.1
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netmask 255.255.0.0
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scope host
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post-up ip addr del 127.0.0.1/8 dev lo
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down ip addr add 127.0.0.1/8 dev lo
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{% endblock loopback %}
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{% block mgmt_interface %}
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# The management network interface
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auto eth0
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{% if (ZTP_DHCP_DISABLED is not defined) and (ZTP is defined) and (ZTP['mode'] is defined and ZTP['mode']['profile'] == 'active') %}
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# ZTP out-of-band interface
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allow-hotplug eth0
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{% if ZTP['mode']['ipv4'] == 'true' %}
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iface eth0 inet dhcp
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{% endif %}
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{% if ZTP['mode']['ipv6'] == 'true' %}
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iface eth0 inet6 dhcp
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up sysctl net.ipv6.conf.eth0.accept_ra=1
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down sysctl net.ipv6.conf.eth0.accept_ra=0
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{% endif %}
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{% if ZTP['mode']['inband'] == 'true' %}
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{% for port in PORT %}
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# ZTP in-band interface {{ port }}
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auto {{ port }}
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allow-hotplug {{ port }}
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{% if PORT_DATA['PORT_TABLE:'+port] is defined and PORT_DATA['PORT_TABLE:'+port]['value']['oper_status'] == 'up' %}
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{% if ZTP['mode']['ipv4'] == 'true' %}
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iface {{ port }} inet dhcp
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{% endif %}
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{% if ZTP['mode']['ipv6'] == 'true' %}
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iface {{ port }} inet6 dhcp
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{% endif %}
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{% endif %}
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{% endfor %}
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{% endif %}
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{% else %}
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{% if MGMT_INTERFACE %}
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{% for (name, prefix) in MGMT_INTERFACE|pfx_filter %}
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iface eth0 {{ 'inet' if prefix | ipv4 else 'inet6' }} static
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address {{ prefix | ip }}
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netmask {{ prefix | netmask if prefix | ipv4 else prefix | prefixlen }}
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network {{ prefix | network }}
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broadcast {{ prefix | broadcast }}
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{% set vrf_table = 'default' %}
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{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
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{% set vrf_table = '5000' %}
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vrf mgmt
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{% endif %}
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########## management network policy routing rules
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# management port up rules
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up ip {{ '-4' if prefix | ipv4 else '-6' }} route add default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table {{ vrf_table }} metric 201
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up ip {{ '-4' if prefix | ipv4 else '-6' }} route add {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table {{ vrf_table }}
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up ip {{ '-4' if prefix | ipv4 else '-6' }} rule add pref 32765 from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table {{ vrf_table }}
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{% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
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up ip rule add pref 32764 to {{ route }} table {{ vrf_table }}
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{% endfor %}
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# management port down rules
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pre-down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete default via {{ MGMT_INTERFACE[(name, prefix)]['gwaddr'] }} dev eth0 table {{ vrf_table }}
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pre-down ip {{ '-4' if prefix | ipv4 else '-6' }} route delete {{ prefix | network }}/{{ prefix | prefixlen }} dev eth0 table {{ vrf_table }}
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pre-down ip {{ '-4' if prefix | ipv4 else '-6' }} rule delete pref 32765 from {{ prefix | ip }}/{{ '32' if prefix | ipv4 else '128' }} table {{ vrf_table }}
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{% for route in MGMT_INTERFACE[(name, prefix)]['forced_mgmt_routes'] %}
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pre-down ip rule delete pref 32764 to {{ route }} table {{ vrf_table }}
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{% endfor %}
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{# TODO: COPP policy type rules #}
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{% endfor %}
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{% else %}
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iface eth0 inet dhcp
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metric 202
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{% if (MGMT_VRF_CONFIG) and (MGMT_VRF_CONFIG['vrf_global']['mgmtVrfEnabled'] == "true") %}
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vrf mgmt
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{% endif %}
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iface eth0 inet6 dhcp
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up sysctl net.ipv6.conf.eth0.accept_ra=1
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down sysctl net.ipv6.conf.eth0.accept_ra=0
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{% endif %}
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{% endif %}
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#
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source /etc/network/interfaces.d/*
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#
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{% endblock mgmt_interface %}
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