4.2

Manually prepare the system for WEKA configuration

If the system is not prepared using the WMS, perform this procedure to set the networking and other tasks before configuring the WEKA cluster.

Once the hardware and software prerequisites are met, prepare the backend servers and clients for the WEKA system configuration.

This preparation consists of the following steps:

  1. Install NIC drivers

  2. Enable SR-IOV (when required)

  3. Configure the networking

  4. Verify the network configuration

  5. Configure the HA networking

  6. Configure the clock synchronization

  7. Disable the NUMA balancing

  8. Disable swap (if any)

  9. Validate the system preparation

Some of the examples contain version-specific information. The software is updated frequently, so the package versions available to you may differ from those presented here.

Related topics

Prerequisites and compatibility

1. Install NIC drivers

2. Enable SR-IOV

Single Root I/O Virtualization (SR-IOV) enablement is mandatory in the following cases:

  • The servers are equipped with Intel NICs.

  • When working with client VMs where it is required to expose the virtual functions (VFs) of a physical NIC to the virtual NICs.

Related topic

Enable the SR-IOV

3. Configure the networking

Ethernet configuration

The following example of the ifcfg script is a reference for configuring the Ethernet interface.

/etc/sysconfig/network-scripts/ifcfg-enp24s0
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="no"
IPV4_FAILURE_FATAL="no"
IPV6INIT="no"
IPV6_AUTOCONF="no"
IPV6_DEFROUTE="no"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="enp24s0"
DEVICE="enp24s0"
ONBOOT="yes"
NM_CONTROLLED=no
IPADDR=192.168.1.1
NETMASK=255.255.0.0
MTU=9000

For the best performance, MTU 9000 (jumbo frame) is recommended. For jumbo frame configuration, refer to your switch vendor documentation.

Bring the interface up using the following command:

# ifup enp24s0

InfiniBand configuration

InfiniBand network configuration normally includes Subnet Manager (SM), but the procedure involved is beyond the scope of this document. However, it is important to be aware of the specifics of your SM configuration, such as partitioning and MTU, because they can affect the configuration of the endpoint ports in Linux. For best performance, MTU of 4092 is recommended.

Refer to the following ifcfg script when the IB network only has the default partition, i.e., "no pkey":

/etc/sysconfig/network-scripts/ifcfg-ib1
TYPE=Infiniband
ONBOOT=yes
BOOTPROTO=static
STARTMODE=auto
USERCTL=no
NM_CONTROLLED=no
DEVICE=ib1
IPADDR=192.168.1.1
NETMASK=255.255.0.0
MTU=4092

Bring the interface up using the following command:

# ifup ib1

Verify that the “default partition” connection is up, with all the attributes set:

# ip a s ib1
4: ib1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 4092 qdisc mq state UP group default qlen 256
  link/infiniband 00:00:03:72:fe:80:00:00:00:00:00:00:24:8a:07:03:00:a8:09:48
brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
    inet 10.0.20.84/24 brd 10.0.20.255 scope global noprefixroute ib0
       valid_lft forever preferred_lft forever

Define the NICs with ignore-carrier

ignore-carrier is a NetworkManager configuration option. When set, it keeps the network interface up even if the physical link is down. It’s useful when services need to bind to the interface address at boot.

The following is an example of configuring ignore-carrier on systems that use NetworkManager on Rocky Linux 8. The exact steps may vary depending on your operating system and its specific network configuration tools. Always refer to your system’s official documentation for accurate information.

  1. Open the /etc/NetworkManager/NetworkManager.conf file to edit it.

  2. Under the [main] section, add one of the following lines depending on the operating system:

    • For some versions of Rocky Linux, RHEL, and CentOS: ignore-carrier=*

    • For some other versions: ignore-carrier=<device-name1>,<device-name2>. Replace <device-name1>,<device-name2> with the actual device names you want to apply this setting to.

Example for RockyLinux and RHEL 8.7:

/etc/NetworkManager/NetworkManager.conf
[main]
ignore-carrier=*

Example for some other versions:

[main]
ignore-carrier=ib0,ib1

  1. Restart the NetworkManager service for the changes to take effect.

4. Verify the network configuration

Use a large-size ICMP ping to check the basic TCP/IP connectivity between the interfaces of the servers:

# ping -M do -s 8972 -c 3 192.168.1.2
PING 192.168.1.2 (192.168.1.2) 8972(9000) bytes of data.
8980 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.063 ms
8980 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=0.087 ms
8980 bytes from 192.168.1.2: icmp_seq=3 ttl=64 time=0.075 ms

--- 192.168.2.0 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.063/0.075/0.087/0.009 ms

The-M do flag prohibits packet fragmentation, which allows verification of correct MTU configuration between the two endpoints.

-s 8972 is the maximum ICMP packet size that can be transferred with MTU 9000, due to the overhead of ICMP and IP protocols.

5. Configure dual-network links with policy-based routing

The following steps provide guidance for configuring dual-network links with policy-based routing on Linux systems. Adjust IP addresses and interface names according to your environment.

General Settings in /etc/sysctl.conf

  1. Open the /etc/sysctl.conf file using a text editor.

  2. Add the following lines at the end of the file to set minimal configurations per InfiniBand (IB) or Ethernet (Eth) interface:

    # Minimal configuration, set per IB/Eth interface
net.ipv4.conf.ib0.arp_announce = 2
net.ipv4.conf.ib1.arp_announce = 2
net.ipv4.conf.ib0.arp_filter = 1
net.ipv4.conf.ib1.arp_filter = 1
net.ipv4.conf.ib0.arp_ignore = 0
net.ipv4.conf.ib1.arp_ignore = 0

# As an alternative set for all interfaces by default
net.ipv4.conf.all.arp_filter = 1
net.ipv4.conf.default.arp_filter = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 0
net.ipv4.conf.default.arp_ignore = 0

  3. Save the file.

  4. Apply the new settings by running:

    sysctl -p /etc/sysctl.conf

RHEL/Rocky/CentOS routing configuration using the Network Scripts

Network scripts are deprecated in RHEL/Rocky 8. For RHEL/Rocky 9, use the Network Manager.

  1. Navigate to /etc/sysconfig/network-scripts/.

  2. Create the file /etc/sysconfig/network-scripts/route-mlnx0 with the following content:

    10.90.0.0/16 dev mlnx0 src 10.90.0.1 table weka1
default via 10.90.2.1 dev mlnx0 table weka1

  3. Create the file /etc/sysconfig/network-scripts/route-mlnx1 with the following content:

    10.90.0.0/16 dev mlnx1 src 10.90.1.1 table weka2
default via 10.90.2.1 dev mlnx1 table weka2

  4. Create the files /etc/sysconfig/network-scripts/rule-mlnx0 and /etc/sysconfig/network-scripts/rule-mlnx1 with the following content:

    table weka1 from 10.90.0.1
table weka2 from 10.90.1.1

  5. Open /etc/iproute2/rt_tables and add the following lines:

    100 weka1
101 weka2

  6. Save the changes.

RHEL/Rocky 9 routing configuration using the Network Manager

  • For Ethernet (ETH): To set up routing for Ethernet connections, use the following commands:

nmcli connection modify eth1 ipv4.routes "10.10.10.0/24 src=10.10.10.1 table=100" ipv4.routing-rules "priority 101 from 10.10.10.1 table 100"
nmcli connection modify eth2 ipv4.routes "10.10.10.0/24 src=10.10.10.101 table=200" ipv4.routing-rules "priority 102 from 10.10.10.101 table 200"

The route's first IP address in the provided commands represents the network's subnet to which the NIC is connected. The last address in the routing rules corresponds to the IP address of the NIC being configured, where eth1 is set to 10.10.10.1.

  • For InfiniBand (IB): To configure routing for InfiniBand connections, use the following commands:

nmcli connection modify ib0 ipv4.route-metric 100
nmcli connection modify ib1 ipv4.route-metric 101

nmcli connection modify ib0 ipv4.routes "10.10.10.0/24 src=10.10.10.1 table=100" 
nmcli connection modify ib0 ipv4.routing-rules "priority 101 from 10.10.10.1 table 100"
nmcli connection modify ib1 ipv4.routes "10.10.10.0/24 src=10.10.10.101 table=200" 
nmcli connection modify ib1 ipv4.routing-rules "priority 102 from 10.10.10.101 table 200"
nmcli connection modify ib1 ipv4.route-metric 101

nmcli connection modify ib0 ipv4.routes "10.10.10.0/24 table=100" 
nmcli connection modify ib0 ipv4.routing-rules "priority 101 from 10.10.10.1 table 100"
nmcli connection modify ib1 ipv4.routes "10.10.10.0/24 table=200" 
nmcli connection modify ib1 ipv4.routing-rules "priority 102 from 10.10.10.101 table 200"

The route's first IP address in the above commands signifies the network's subnet associated with the respective NIC. The last address in the routing rules corresponds to the IP address of the NIC being configured, where ib0 is set to 10.10.10.1.

Ubuntu Netplan configuration

  1. Open the Netplan configuration file /etc/netplan/01-netcfg.yaml and adjust it:

    network:
    version: 2
    renderer: networkd
    ethernets:
        enp2s0:
            dhcp4: true
            nameservers:
                    addresses: [8.8.8.8]
        ib1:
            addresses:
                    [10.222.0.10/24]
            routes:
                    - to: 10.222.0.0/24
                      via: 10.222.0.10
                      table: 100
            routing-policy:
                    - from: 10.222.0.10
                      table: 100
                      priority: 32764
            ignore-carrier: true
            
        ib2:
            addresses:
                    [10.222.0.20/24]
            routes:
                    - to: 10.222.0.0/24
                      via: 10.222.0.20
                      table: 101
            routing-policy:
                    - from: 10.222.0.20
                      table: 101
                      priority: 32765
            ignore-carrier: true

  2. After adjusting the Netplan configuration file, run the following commands:

    ip route add 10.222.0.0/24 via 10.222.0.10 dev ib1 table 100
ip route add 10.222.0.0/24 via 10.222.0.20 dev ib2 table 101

SLES/SUSE configuration

  1. Create /etc/sysconfig/network/ifrule-eth2 with:

    ipv4 from 192.168.11.21 table 100

  2. Create /etc/sysconfig/network/ifrule-eth4 with:

    ipv4 from 192.168.11.31 table 101

  3. Create /etc/sysconfig/network/scripts/ifup-route.eth2 with:

    ip route add 192.168.11.0/24 dev eth2 src 192.168.11.21 table weka1

  4. Create /etc/sysconfig/network/scripts/ifup-route.eth4 with:

    ip route add 192.168.11.0/24 dev eth4 src 192.168.11.31 table weka2

  5. Add the weka lines to /etc/iproute2/rt_tables:

    100 weka1
101 weka2

  6. Restart the interfaces or reboot the machine:

    ifdown eth2; ifdown eth4; ifup eth2; ifup eth4

Related topic

6. Configure the clock synchronization

The synchronization of time on computers and networks is considered good practice and is vitally important for the stability of the WEKA system. Proper timestamp alignment in packets and logs is very helpful for the efficient and quick resolution of issues.

Configure the clock synchronization software on the backends and clients according to the specific vendor instructions (see your OS documentation), before installing the WEKA software.

7. Disable the NUMA balancing

The WEKA system autonomously manages NUMA balancing, making optimal decisions. Therefore, turning off the Linux kernel’s NUMA balancing feature is a mandatory requirement to prevent extra latencies in operations. It’s crucial that the disabled NUMA balancing remains consistent and isn’t altered by a server reboot.

To persistently disable NUMA balancing, follow these steps:

  1. Open the file located at: /etc/sysctl.conf

  2. Append the following line: kernel.numa_balancing=disable

8. Disable swap (if any)

WEKA highly recommends that any servers used as backends have no swap configured. This is distribution-dependent but is often a case of commenting out any swap entries in /etc/fstab and rebooting.

9. Validate the system preparation

The wekachecker is a tool that validates the readiness of the servers in the cluster before installing the WEKA software.

The wekachecker performs the following validations:

  • Dataplane IP, jumbo frames, and routing

  • ssh connection to all servers

  • Timesync

  • OS release

  • Sufficient capacity in /opt/weka

  • Available RAM

  • Internet connection availability

  • NTP

  • DNS configuration

  • Firewall rules

  • WEKA required packages

  • OFED required packages

  • Recommended packages

  • HT/AMT is disabled

  • The kernel is supported

  • CPU has a supported AES, and it is enabled

  • Numa balancing is enabled

  • RAM state

  • XFS FS type installed

  • Mellanox OFED is installed

  • IOMMU mode for SSD drives is disabled

  • rpcbind utility is enabled

  • SquashFS is enabled

  • noexec mount option on /tmp

The wekacheckertool applies to all WEKA versions. From V4.0, the following validations are not relevant, although the tool displays them:

  • OS has SELinux disabled or in permissive mode.

  • Network Manager is disabled.

Procedure

  1. Download the wekachecker tarball from https://github.com/weka/tools/blob/master/install/wekachecker and extract it.

  2. From the install directory, run ./wekachecker <hostnames/IPs> Where: The hostnames/IPs is a space-separated list of all the cluster hostnames or IP addresses connected to the high-speed networking. Example: ./wekachecker 10.1.1.11 10.1.1.12 10.1.1.4 10.1.1.5 10.1.1.6 10.1.1.7 10.1.1.8

  3. Review the output. If failures or warnings are reported, investigate them and correct them as necessary. Repeat the validation until no important issues are reported. The wekachecker writes any failures or warnings to the file: test_results.txt.

Once the report has no failures or warnings that must be fixed, you can install the WEKA software.

wekachecker report example
Dataplane IP Jumbo Frames/Routing test                       [PASS]
Check ssh to all hosts                                       [PASS]
Verify timesync                                              [PASS]
Check if OS has SELinux disabled or in permissive mode       [PASS]
Check OS Release...                                          [PASS]
Check /opt/weka for sufficient capacity...                   [WARN]
Check available RAM...                                       [PASS]
Check if internet connection available...                    [PASS]
Check for NTP...                                             [PASS]
Check DNS configuration...                                   [PASS]
Check Firewall rules...                                      [PASS]
Check for WEKA Required Packages...                          [PASS]
Check for OFED Required Packages...                          [PASS]
Check for Recommended Packages...                            [WARN]
Check if HT/AMT is disabled                                  [WARN]
Check if kernel is supported...                              [PASS]
Check if CPU has AES enabled and supported                   [PASS]
Check if Network Manager is disabled                         [WARN]
Checking if Numa balancing is enabled                        [WARN]
Checking RAM state for errors                                [PASS]
Check for XFS FS type installed                              [PASS]
Check if Mellanox OFED is installed                          [PASS]
Check for IOMMU disabled                                     [PASS]
Check for rpcbind enabled                                    [PASS]
Check for squashfs enabled                                   [PASS]
Check for /tmp noexec mount                                  [PASS]

RESULTS: 21 Tests Passed, 0 Failed, 5 Warnings

What to do next?

If you can use the WEKA Configurator, go to:

Configure the WEKA cluster using the WEKA Configurator

Otherwise, go to:

Manually configure the WEKA cluster using the resource generator

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