├── .gitignore ├── Dockerfile ├── LICENSE ├── README.md └── scripts ├── bootp-server-setup.sh └── build-k3s-cluster-image.sh /.gitignore: -------------------------------------------------------------------------------- 1 | .idea 2 | *.img 3 | *.pem 4 | *.pub 5 | *.zip 6 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM debian:buster-slim 2 | 3 | VOLUME /var/local 4 | 5 | WORKDIR /rpi 6 | 7 | RUN apt-get update && \ 8 | apt-get install -y debootstrap kpartx qemu-user-static xz-utils sharutils wget curl unzip git dosfstools parted && \ 9 | apt-get clean 10 | 11 | COPY scripts/build-k3s-cluster-image.sh . 12 | 13 | CMD ["bash", "build-k3s-cluster-image.sh"] 14 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Mozilla Public License Version 2.0 2 | ================================== 3 | 4 | 1. Definitions 5 | -------------- 6 | 7 | 1.1. "Contributor" 8 | means each individual or legal entity that creates, contributes to 9 | the creation of, or owns Covered Software. 10 | 11 | 1.2. "Contributor Version" 12 | means the combination of the Contributions of others (if any) used 13 | by a Contributor and that particular Contributor's Contribution. 14 | 15 | 1.3. "Contribution" 16 | means Covered Software of a particular Contributor. 17 | 18 | 1.4. "Covered Software" 19 | means Source Code Form to which the initial Contributor has attached 20 | the notice in Exhibit A, the Executable Form of such Source Code 21 | Form, and Modifications of such Source Code Form, in each case 22 | including portions thereof. 23 | 24 | 1.5. "Incompatible With Secondary Licenses" 25 | means 26 | 27 | (a) that the initial Contributor has attached the notice described 28 | in Exhibit B to the Covered Software; or 29 | 30 | (b) that the Covered Software was made available under the terms of 31 | version 1.1 or earlier of the License, but not also under the 32 | terms of a Secondary License. 33 | 34 | 1.6. "Executable Form" 35 | means any form of the work other than Source Code Form. 36 | 37 | 1.7. "Larger Work" 38 | means a work that combines Covered Software with other material, in 39 | a separate file or files, that is not Covered Software. 40 | 41 | 1.8. "License" 42 | means this document. 43 | 44 | 1.9. "Licensable" 45 | means having the right to grant, to the maximum extent possible, 46 | whether at the time of the initial grant or subsequently, any and 47 | all of the rights conveyed by this License. 48 | 49 | 1.10. "Modifications" 50 | means any of the following: 51 | 52 | (a) any file in Source Code Form that results from an addition to, 53 | deletion from, or modification of the contents of Covered 54 | Software; or 55 | 56 | (b) any new file in Source Code Form that contains any Covered 57 | Software. 58 | 59 | 1.11. "Patent Claims" of a Contributor 60 | means any patent claim(s), including without limitation, method, 61 | process, and apparatus claims, in any patent Licensable by such 62 | Contributor that would be infringed, but for the grant of the 63 | License, by the making, using, selling, offering for sale, having 64 | made, import, or transfer of either its Contributions or its 65 | Contributor Version. 66 | 67 | 1.12. "Secondary License" 68 | means either the GNU General Public License, Version 2.0, the GNU 69 | Lesser General Public License, Version 2.1, the GNU Affero General 70 | Public License, Version 3.0, or any later versions of those 71 | licenses. 72 | 73 | 1.13. "Source Code Form" 74 | means the form of the work preferred for making modifications. 75 | 76 | 1.14. "You" (or "Your") 77 | means an individual or a legal entity exercising rights under this 78 | License. For legal entities, "You" includes any entity that 79 | controls, is controlled by, or is under common control with You. For 80 | purposes of this definition, "control" means (a) the power, direct 81 | or indirect, to cause the direction or management of such entity, 82 | whether by contract or otherwise, or (b) ownership of more than 83 | fifty percent (50%) of the outstanding shares or beneficial 84 | ownership of such entity. 85 | 86 | 2. License Grants and Conditions 87 | -------------------------------- 88 | 89 | 2.1. Grants 90 | 91 | Each Contributor hereby grants You a world-wide, royalty-free, 92 | non-exclusive license: 93 | 94 | (a) under intellectual property rights (other than patent or trademark) 95 | Licensable by such Contributor to use, reproduce, make available, 96 | modify, display, perform, distribute, and otherwise exploit its 97 | Contributions, either on an unmodified basis, with Modifications, or 98 | as part of a Larger Work; and 99 | 100 | (b) under Patent Claims of such Contributor to make, use, sell, offer 101 | for sale, have made, import, and otherwise transfer either its 102 | Contributions or its Contributor Version. 103 | 104 | 2.2. Effective Date 105 | 106 | The licenses granted in Section 2.1 with respect to any Contribution 107 | become effective for each Contribution on the date the Contributor first 108 | distributes such Contribution. 109 | 110 | 2.3. Limitations on Grant Scope 111 | 112 | The licenses granted in this Section 2 are the only rights granted under 113 | this License. No additional rights or licenses will be implied from the 114 | distribution or licensing of Covered Software under this License. 115 | Notwithstanding Section 2.1(b) above, no patent license is granted by a 116 | Contributor: 117 | 118 | (a) for any code that a Contributor has removed from Covered Software; 119 | or 120 | 121 | (b) for infringements caused by: (i) Your and any other third party's 122 | modifications of Covered Software, or (ii) the combination of its 123 | Contributions with other software (except as part of its Contributor 124 | Version); or 125 | 126 | (c) under Patent Claims infringed by Covered Software in the absence of 127 | its Contributions. 128 | 129 | This License does not grant any rights in the trademarks, service marks, 130 | or logos of any Contributor (except as may be necessary to comply with 131 | the notice requirements in Section 3.4). 132 | 133 | 2.4. Subsequent Licenses 134 | 135 | No Contributor makes additional grants as a result of Your choice to 136 | distribute the Covered Software under a subsequent version of this 137 | License (see Section 10.2) or under the terms of a Secondary License (if 138 | permitted under the terms of Section 3.3). 139 | 140 | 2.5. Representation 141 | 142 | Each Contributor represents that the Contributor believes its 143 | Contributions are its original creation(s) or it has sufficient rights 144 | to grant the rights to its Contributions conveyed by this License. 145 | 146 | 2.6. Fair Use 147 | 148 | This License is not intended to limit any rights You have under 149 | applicable copyright doctrines of fair use, fair dealing, or other 150 | equivalents. 151 | 152 | 2.7. Conditions 153 | 154 | Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted 155 | in Section 2.1. 156 | 157 | 3. Responsibilities 158 | ------------------- 159 | 160 | 3.1. Distribution of Source Form 161 | 162 | All distribution of Covered Software in Source Code Form, including any 163 | Modifications that You create or to which You contribute, must be under 164 | the terms of this License. You must inform recipients that the Source 165 | Code Form of the Covered Software is governed by the terms of this 166 | License, and how they can obtain a copy of this License. You may not 167 | attempt to alter or restrict the recipients' rights in the Source Code 168 | Form. 169 | 170 | 3.2. Distribution of Executable Form 171 | 172 | If You distribute Covered Software in Executable Form then: 173 | 174 | (a) such Covered Software must also be made available in Source Code 175 | Form, as described in Section 3.1, and You must inform recipients of 176 | the Executable Form how they can obtain a copy of such Source Code 177 | Form by reasonable means in a timely manner, at a charge no more 178 | than the cost of distribution to the recipient; and 179 | 180 | (b) You may distribute such Executable Form under the terms of this 181 | License, or sublicense it under different terms, provided that the 182 | license for the Executable Form does not attempt to limit or alter 183 | the recipients' rights in the Source Code Form under this License. 184 | 185 | 3.3. Distribution of a Larger Work 186 | 187 | You may create and distribute a Larger Work under terms of Your choice, 188 | provided that You also comply with the requirements of this License for 189 | the Covered Software. If the Larger Work is a combination of Covered 190 | Software with a work governed by one or more Secondary Licenses, and the 191 | Covered Software is not Incompatible With Secondary Licenses, this 192 | License permits You to additionally distribute such Covered Software 193 | under the terms of such Secondary License(s), so that the recipient of 194 | the Larger Work may, at their option, further distribute the Covered 195 | Software under the terms of either this License or such Secondary 196 | License(s). 197 | 198 | 3.4. Notices 199 | 200 | You may not remove or alter the substance of any license notices 201 | (including copyright notices, patent notices, disclaimers of warranty, 202 | or limitations of liability) contained within the Source Code Form of 203 | the Covered Software, except that You may alter any license notices to 204 | the extent required to remedy known factual inaccuracies. 205 | 206 | 3.5. Application of Additional Terms 207 | 208 | You may choose to offer, and to charge a fee for, warranty, support, 209 | indemnity or liability obligations to one or more recipients of Covered 210 | Software. However, You may do so only on Your own behalf, and not on 211 | behalf of any Contributor. You must make it absolutely clear that any 212 | such warranty, support, indemnity, or liability obligation is offered by 213 | You alone, and You hereby agree to indemnify every Contributor for any 214 | liability incurred by such Contributor as a result of warranty, support, 215 | indemnity or liability terms You offer. You may include additional 216 | disclaimers of warranty and limitations of liability specific to any 217 | jurisdiction. 218 | 219 | 4. Inability to Comply Due to Statute or Regulation 220 | --------------------------------------------------- 221 | 222 | If it is impossible for You to comply with any of the terms of this 223 | License with respect to some or all of the Covered Software due to 224 | statute, judicial order, or regulation then You must: (a) comply with 225 | the terms of this License to the maximum extent possible; and (b) 226 | describe the limitations and the code they affect. Such description must 227 | be placed in a text file included with all distributions of the Covered 228 | Software under this License. Except to the extent prohibited by statute 229 | or regulation, such description must be sufficiently detailed for a 230 | recipient of ordinary skill to be able to understand it. 231 | 232 | 5. Termination 233 | -------------- 234 | 235 | 5.1. The rights granted under this License will terminate automatically 236 | if You fail to comply with any of its terms. However, if You become 237 | compliant, then the rights granted under this License from a particular 238 | Contributor are reinstated (a) provisionally, unless and until such 239 | Contributor explicitly and finally terminates Your grants, and (b) on an 240 | ongoing basis, if such Contributor fails to notify You of the 241 | non-compliance by some reasonable means prior to 60 days after You have 242 | come back into compliance. Moreover, Your grants from a particular 243 | Contributor are reinstated on an ongoing basis if such Contributor 244 | notifies You of the non-compliance by some reasonable means, this is the 245 | first time You have received notice of non-compliance with this License 246 | from such Contributor, and You become compliant prior to 30 days after 247 | Your receipt of the notice. 248 | 249 | 5.2. If You initiate litigation against any entity by asserting a patent 250 | infringement claim (excluding declaratory judgment actions, 251 | counter-claims, and cross-claims) alleging that a Contributor Version 252 | directly or indirectly infringes any patent, then the rights granted to 253 | You by any and all Contributors for the Covered Software under Section 254 | 2.1 of this License shall terminate. 255 | 256 | 5.3. In the event of termination under Sections 5.1 or 5.2 above, all 257 | end user license agreements (excluding distributors and resellers) which 258 | have been validly granted by You or Your distributors under this License 259 | prior to termination shall survive termination. 260 | 261 | ************************************************************************ 262 | * * 263 | * 6. Disclaimer of Warranty * 264 | * ------------------------- * 265 | * * 266 | * Covered Software is provided under this License on an "as is" * 267 | * basis, without warranty of any kind, either expressed, implied, or * 268 | * statutory, including, without limitation, warranties that the * 269 | * Covered Software is free of defects, merchantable, fit for a * 270 | * particular purpose or non-infringing. The entire risk as to the * 271 | * quality and performance of the Covered Software is with You. * 272 | * Should any Covered Software prove defective in any respect, You * 273 | * (not any Contributor) assume the cost of any necessary servicing, * 274 | * repair, or correction. This disclaimer of warranty constitutes an * 275 | * essential part of this License. No use of any Covered Software is * 276 | * authorized under this License except under this disclaimer. * 277 | * * 278 | ************************************************************************ 279 | 280 | ************************************************************************ 281 | * * 282 | * 7. Limitation of Liability * 283 | * -------------------------- * 284 | * * 285 | * Under no circumstances and under no legal theory, whether tort * 286 | * (including negligence), contract, or otherwise, shall any * 287 | * Contributor, or anyone who distributes Covered Software as * 288 | * permitted above, be liable to You for any direct, indirect, * 289 | * special, incidental, or consequential damages of any character * 290 | * including, without limitation, damages for lost profits, loss of * 291 | * goodwill, work stoppage, computer failure or malfunction, or any * 292 | * and all other commercial damages or losses, even if such party * 293 | * shall have been informed of the possibility of such damages. This * 294 | * limitation of liability shall not apply to liability for death or * 295 | * personal injury resulting from such party's negligence to the * 296 | * extent applicable law prohibits such limitation. Some * 297 | * jurisdictions do not allow the exclusion or limitation of * 298 | * incidental or consequential damages, so this exclusion and * 299 | * limitation may not apply to You. * 300 | * * 301 | ************************************************************************ 302 | 303 | 8. Litigation 304 | ------------- 305 | 306 | Any litigation relating to this License may be brought only in the 307 | courts of a jurisdiction where the defendant maintains its principal 308 | place of business and such litigation shall be governed by laws of that 309 | jurisdiction, without reference to its conflict-of-law provisions. 310 | Nothing in this Section shall prevent a party's ability to bring 311 | cross-claims or counter-claims. 312 | 313 | 9. Miscellaneous 314 | ---------------- 315 | 316 | This License represents the complete agreement concerning the subject 317 | matter hereof. If any provision of this License is held to be 318 | unenforceable, such provision shall be reformed only to the extent 319 | necessary to make it enforceable. Any law or regulation which provides 320 | that the language of a contract shall be construed against the drafter 321 | shall not be used to construe this License against a Contributor. 322 | 323 | 10. Versions of the License 324 | --------------------------- 325 | 326 | 10.1. New Versions 327 | 328 | Mozilla Foundation is the license steward. Except as provided in Section 329 | 10.3, no one other than the license steward has the right to modify or 330 | publish new versions of this License. Each version will be given a 331 | distinguishing version number. 332 | 333 | 10.2. Effect of New Versions 334 | 335 | You may distribute the Covered Software under the terms of the version 336 | of the License under which You originally received the Covered Software, 337 | or under the terms of any subsequent version published by the license 338 | steward. 339 | 340 | 10.3. Modified Versions 341 | 342 | If you create software not governed by this License, and you want to 343 | create a new license for such software, you may create and use a 344 | modified version of this License if you rename the license and remove 345 | any references to the name of the license steward (except to note that 346 | such modified license differs from this License). 347 | 348 | 10.4. Distributing Source Code Form that is Incompatible With Secondary 349 | Licenses 350 | 351 | If You choose to distribute Source Code Form that is Incompatible With 352 | Secondary Licenses under the terms of this version of the License, the 353 | notice described in Exhibit B of this License must be attached. 354 | 355 | Exhibit A - Source Code Form License Notice 356 | ------------------------------------------- 357 | 358 | This Source Code Form is subject to the terms of the Mozilla Public 359 | License, v. 2.0. If a copy of the MPL was not distributed with this 360 | file, You can obtain one at http://mozilla.org/MPL/2.0/. 361 | 362 | If it is not possible or desirable to put the notice in a particular 363 | file, then You may include the notice in a location (such as a LICENSE 364 | file in a relevant directory) where a recipient would be likely to look 365 | for such a notice. 366 | 367 | You may add additional accurate notices of copyright ownership. 368 | 369 | Exhibit B - "Incompatible With Secondary Licenses" Notice 370 | --------------------------------------------------------- 371 | 372 | This Source Code Form is "Incompatible With Secondary Licenses", as 373 | defined by the Mozilla Public License, v. 2.0. 374 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # rpi4-k3s 2 | Automation for setting up a k3s cluster on Raspberry Pi 4 SBCs. 3 | 4 | Builds a custom Raspbian image pre-configured for k3s. 5 | 6 | Does a few things. 7 | 1. Provides a Dockerfile to create a minbase Raspbian image with k3s and k3sup preinstalled. 8 | 2. Exports PEM and public key to access cluster machines. 9 | 3. Sets up rc.local so that on first boot, the cluster master installs and configures a PXE boot environment for other machines. 10 | 11 | --- 12 | 13 | ### Usage 14 | 15 | ##### To Get a Cluster Running 16 | 17 | ###### Option 1 18 | 1. `git clone https://github.com/kgolsen/rpi4-k3s.git` 19 | 2. `cd rpi4-k3s; docker build . -t rpi4-k3s; docker run --rm --privileged -v :/var/local rpi4-k3s` 20 | 21 | ###### Option 2 22 | 1. `docker run --rm --privileged -v :/var/local kgolsen/rpi4-k3s:latest` 23 | 24 | ###### Note: 25 | On Linux hosts, you may have to add `--cap-add=CAP_MKNOD` to allow creation of loopback devices in the container. 26 | 27 | ###### Continue... 28 | 29 | 3. You now have an image, `k3s-base-image.img`, burnable to MicroSD with something like Etcher. 30 | - You also have the RSA keypair `k3s-masterkey.{pem,pub}`, which will allow you to SSH into any cluster member as the user `k3s`. 31 | 4. Boot up the rpi4 you intend to be the cluster master. First boot will take several minutes as the PXE boot 32 | environment is built. Afterwards, rc.local will have its execute bit disabled and the rpi4 will reboot. You are now 33 | ready to add more nodes to the cluster. 34 | 5. More coming soon... 35 | 36 | --- 37 | 38 | ### Notes 39 | 40 | 2020-05-12: Now that I'm working on the PXE boot, it's important to note that 41 | the cluster IP space is set (and small). I'm building this cluster behind a Mikrotik 42 | CRS112-8P-4S-IN, so it's important the cluster is sitting behind a 43 | programmable router or network issues will ensue. 44 | -------------------------------------------------------------------------------- /scripts/bootp-server-setup.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | # File: scripts/bootp-server-setup.sh 4 | # Date: 21 Oct 2019 5 | # Author: Kyle Olsen 6 | # 7 | # Description: this script runs at the k3s master's first boot to install and configure a TFTP BOOTP server for cluster 8 | # slaves' PXE boot. 9 | 10 | # This Source Code Form is subject to the terms of the Mozilla Public 11 | # License, v. 2.0. If a copy of the MPL was not distributed with this 12 | # file, You can obtain one at https://mozilla.org/MPL/2.0/. 13 | 14 | # Fail on any non-0 command exit 15 | set -e 16 | 17 | # Must be run as root 18 | if (( EUID != 0 )); then 19 | echo "ERROR: must be run as root" 20 | exit 1 21 | fi 22 | 23 | # Mask rpi-eeprom to prevent a future firmware update from disabling PXE 24 | systemctl mask rpi-eeprom-update 25 | 26 | # Install rsync 27 | apt-get install -y rsync 28 | 29 | # Create directory structure and copy FS 30 | mkdir -p /tftp/k3s/node 31 | mkdir /tftp/boot 32 | rsync -xa --exclude /tftp / /tftp/k3s/node 33 | 34 | # Install service for PXE (done after rsync so clients don't have PXE-serving services installed 35 | apt-get install -y nfs-kernel-server dnsmasq rpcbind 36 | 37 | # Setup TFTP boot 38 | chmod 777 /tftp/boot 39 | cp -r /boot/* /tftp/boot 40 | 41 | # Setup NFS exports for boot, root FS 42 | echo "/tftp/k3s/node *(rw,sync,no_subtree_check,no_root_squash)" | tee -a /etc/exports 43 | echo "/tftp/boot *(rw,sync,no_subtree_check,no_root_squash)" | tee -a /etc/exports 44 | 45 | # Turn off DHCP for eth0 46 | cat << EOF | tee /etc/network/interface 47 | TODO: Fix, we're not using NetworkManager 48 | EOF 49 | 50 | # Stop dhcpd and disable 51 | systemctl stop dhcpd 52 | systemctl disable dhcpd 53 | 54 | # Configure dnsmasq for PXE boot 55 | cat << EOF | tee /etc/dnsmasq.conf 56 | interface=eth0 57 | no-hosts 58 | dhcp-range=10.100.100.10,10.100.100.20,12h 59 | log-dhcp 60 | enable-tftp 61 | tftp-root=/tftp/boot 62 | pxe-service=0,"k3s PXE Boot" 63 | EOF 64 | 65 | # Enable rpcbind and NFS 66 | systemctl enable rpcbind 67 | systemctl enable nfs-kernel-server 68 | systemctl enable dnsmasq 69 | 70 | # Setup TFTP boot command 71 | cat << EOF | tee /tftp/boot/cmdline.txt 72 | console=serial0,115200 console=tty1 root=/dev/nfs nfsroot=10.100.100.100:/tftp/k3s/client,vers=3 rw ip=dhcp rootwait elevator=deadline 73 | EOF 74 | 75 | # Chroot to client and prep 76 | # TODO: (in rc.local) ssh reconfig, hostname reconfig, k3s reconfig 77 | cd /tftp/k3s/client 78 | mount --bind /dev dev 79 | mount --bind /sys sys 80 | mount --bind /proc proc 81 | cat << EOF | chroot . &> /dev/null 82 | # remove host SSH keys 83 | rm /etc/ssh/ssh_host_* 84 | 85 | # Configure fstab for PXE boot 86 | cat << EOFS | tee /etc/fstab 87 | proc /proc proc defaults 0 0 88 | 10.100.100.100:/tftp/boot /boot nfs defaults,vers=3 0 0 89 | EOFS 90 | 91 | # Create rc.local to reconfigure SSH and hostname on first boot, then join cluster 92 | cat << EORC | tee /etc/rc.local 93 | #!/bin/bash 94 | 95 | dpkg-reconfigure openssh-server 96 | systemctl enable ssh 97 | 98 | # Change hostname 99 | SERNO=$(cat /proc/cpuinfo |grep Serial | awk '{ print $3 }') 100 | HOSTN="rpi-k3s-node-${SERNO}" 101 | echo "${HOSTN}" > /etc/hostname 102 | sed -i -e "s/rpi-k3s-master/${HOSTN}/" /etc/hosts 103 | hostname "${HOSTN}" 104 | 105 | # Determine if this is supposed to be a master node (i.e. is a 4GB rpi4) 106 | # ...look, I know this is dumb, but I have three 4GB rpi4s for the control plane and 4 8GB rpi4s for workers. 107 | # Expediency is winning over correctness for now. So sue me. 108 | SBC_MEM=$(free -m | grep Mem | awk '{ print $2 }') 109 | if (( SBC_MEM < 4000 )); then 110 | # control node 111 | echo "I'm the boss of you!" > /tmp/msg 112 | else 113 | # worker node 114 | echo "You're not the boss of me!" > /tmp/msg 115 | fi 116 | EORC 117 | EOF 118 | -------------------------------------------------------------------------------- /scripts/build-k3s-cluster-image.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | # File: scripts/build-k3s-cluster-image.sh 4 | # Date: 22 May 2020 5 | # Author: Kyle Olsen 6 | # 7 | # Description: Debootstrap a custom minbase Raspbian image from in order to minimize the 8 | # image TFTP has to serve every time a new cluster member boots/reboots. 9 | 10 | # This Source Code Form is subject to the terms of the Mozilla Public 11 | # License, v. 2.0. If a copy of the MPL was not distributed with this 12 | # file, You can obtain one at https://mozilla.org/MPL/2.0/. 13 | 14 | # Fail on any non-0 command exit 15 | set -e 16 | 17 | # Check that script is running with EUID 0 (root) 18 | if (( EUID != 0 )); then 19 | echo "ERROR: must run as root" 20 | exit 1 21 | fi 22 | 23 | IMG_FILE="k3s-base-image.img" 24 | # Create an empty 1GiB image 25 | dd if=/dev/zero of="${IMG_FILE}" bs=1M count=1024 26 | 27 | # Partition image (yes, using parted would look nicer but fdisk means I don't have to do math. Yet. It's coming. 28 | fdisk "${IMG_FILE}" < /etc/hostname 103 | cat << EEOF | tee /etc/hosts 104 | 127.0.0.1 localhost 105 | 127.0.0.1 k3s-base 106 | 107 | ::1 ip6-localhost ip6-loopback 108 | fe00::0 ip6-localnet 109 | ff00::0 ip6-mcastprefix 110 | ff02::1 ip6-allnodes 111 | ff02::2 ip6-allrouters 112 | ff02::3 ip6-allhosts 113 | EEOF 114 | 115 | # Setup k3s user and RSA keys 116 | useradd -m -r -U k3s 117 | mkdir -p /home/k3s/.ssh 118 | cd /home/k3s/.ssh 119 | ssh-keygen -f k3s-masterkey -t rsa -b 4096 -N '' -m PEM -q 120 | mv k3s-masterkey k3s-masterkey.pem 121 | cat k3s-masterkey.pub > authorized_keys 122 | chmod 644 authorized_keys 123 | chmod 400 k3s-masterkey.pem 124 | chmod 700 /home/k3s/.ssh 125 | chown -R k3s:k3s /home/k3s/.ssh 126 | 127 | # setup rc.local to install k3sup 128 | cat << EORC | tee /etc/rc.local &> /dev/null 129 | #!/bin/bash 130 | # update and upgrade everything (no effect if booted shortly after image creation) 131 | apt-get update 132 | apt upgrade -y 133 | 134 | # pull k3sup installer and run 135 | wget -q --compression=auto https://get.k3sup.dev -O /tmp/install-k3sup.sh 136 | chmod +x /usr/local/bin/*.sh 137 | /tmp/install-k3sup.sh && rm /tmp/install-k3sup.sh 138 | 139 | # disable password auth for SSH 140 | sed -i -e 's/#PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config 141 | 142 | # disable swapfile 143 | systemctl disable dphys-swapfile.service 144 | systemctl stop dphys-swapfile.service 145 | 146 | # Change master hostname 147 | echo "rpi-k3s-origin" > /etc/hostname 148 | sed -i -e 's/k3s-base/rpi-k3s-origin/' /etc/hosts 149 | 150 | # Get and run bootp setup script 151 | wget -q --compression=auto https://raw.githubusercontent.com/kgolsen/rpi4-k3s/master/scripts/bootp-server-setup.sh \ 152 | -O /usr/local/bin/bootp-server-setup.sh 153 | chmod +x /usr/local/bin/*.sh 154 | 155 | /usr/local/bin/bootp-server-setup.sh 156 | 157 | chmod -x /etc/rc.local 158 | EORC 159 | chmod +x /etc/rc.local 160 | exit 161 | EOF 162 | 163 | # Copy RSA keys to volume 164 | cp "${ROOT}/home/k3s/.ssh/k3s-masterkey.pem" /var/local/ 165 | cp "${ROOT}/home/k3s/.ssh/k3s-masterkey.pub" /var/local/ 166 | 167 | # Unmount and shrink image 168 | umount "${BOOT}" 169 | umount "${ROOT}" 170 | 171 | MIN_IMG_FILE="${IMG_FILE:0:-4}-min.img" 172 | wget https://raw.githubusercontent.com/kgolsen/PiShrink/master/pishrink.sh -O pishrink.sh 173 | /bin/bash pishrink.sh -p "${IMG_FILE}" "${MIN_IMG_FILE}" 174 | 175 | # Copy raw and shrunk images to volume 176 | cp "${IMG_FILE}" /var/local/ 177 | cp "${MIN_IMG_FILE}" /var/local/ 178 | --------------------------------------------------------------------------------